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Characteristics of Laminar Flow in Pipelines of Homogenous Alum Sludge Approximated with use of the Vočadlo Model for Viscoplastic Liquids

Jan Kempiński Marek M. Sozański Zbysław Dymaczewski Robert Świerzko
Archives of Environmental Protection | 2014 | vol. 40 | No 4 | DOI: 10.2478/aep-2014-0037
Keywords Alum sludge rheology hydrotransport Reynolds number
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Abstract

The study presents the manners of determination of the Darcy friction factor λ for a homogenous hydromixture of alum sludge of varied hydration and temperature for the laminar flow zone. The rheological evaluation of the hydromixture as a viscoplastic body has been conducted with use of measurements of viscosity. The curves of flow were approximated with use of the generalized Vočadlo model. The Darcy friction factor λ of the pipeline was determined with use of the non-dimensional criterion λ(Regen) and λ(Re, He).
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Authors and Affiliations

Jan Kempiński
Marek M. Sozański
Zbysław Dymaczewski
Robert Świerzko

Numerical modeling of heat transfer in Al2O3/H2O nanofluid flowing through a Bessel-like converging pipe

Chukwuka S. Iweka Olatomide G. Fadodun
Archives of Thermodynamics | 2021 | vol. 42 | No 2 | 121-153 | DOI: 10.24425/ather.2021.137557
Keywords Nanofluid Nusselt number Response surface methodology Reynolds number Convergence index
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Abstract

This paper studies hydrodynamic and heat transfer performance of Al2O3/H2O nanofluid flowing through a Bessel-like converging pipe in laminar flow regime using the computational fluid dynamic approach. A parametric study was carried out on the effect of Reynolds number (300– 1200), convergence index (0-3) and nanoparticle concentration (0–3%) on the both hydrodynamic and thermal fields. The results showed the pressure drop profile along the axial length of the converging pipes is parabolic compared to the downward straight profile obtained in a straight pipe. Furthermore, an increase in convergence index, Reynolds number and nanoparticle concentration were found to enhance convective heat transfer performance. Also, a new empirical model was developed to estimates the average Nusselt number as a function of aforementioned variables. Finally, the result of the thermohydraulic performance evaluation criterion showed that the usage of Bessel-like converging pipes is advantageous at a low Reynolds number.
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Authors and Affiliations

Chukwuka S. Iweka
1
Olatomide G. Fadodun
2
  1. Department of Mechanical Engineering, Delta State Polytechnic, Ozoro, P.M.B 5, Ozoro 334111, Delta State, Nigeria
  2. Centre for Energy Research and Development, Obafemi Awolowo University, Ile-Ife 220282, Osun State, Nigeria

Numerical investigation of convective heat transfer of single wall carbon nanotube nanofluid laminar flow inside a circular tube

Farqad Rasheed Saeed Marwah A. Jasim Natheer B. Mahmood Zahraa M. Jaffar
Archives of Thermodynamics | 2021 | vol. 42 | No 2 | 103-119 | DOI: 10.24425/ather.2021.137556
Keywords Convective heat transfer Reynolds number Nanofluid single wall carbon nanotube SWCNT Laminar flow
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Abstract

This study presents the behavior of a single wall carbon nanotube (SWCNT)/water nanofluid for convective laminar flow inside a straight circular pipe heated by a constant heat flux. Five volume fractions of SWCNT were used to investigate their effect on the heat transfer coefficient, Nusselt number, temperature distribution and velocity field in comparison with pure water flow. One model for each property was tested to calculate the effective thermal conductivity, effective dynamic viscosity, and effective specific heat of the SWCNT/water mixture. The models were extracted from experimental data of a previous work. The outcomes indicate that the rheological behavior of SWCNT introduces a special effect on the SWCNT/water properties, which vary with SWCNT volume fraction. The results show an improvement in the heat transfer coefficient with increasing volume fraction of nanoparticles. The velocity of SWCNT/water nanofluid increased by adding SWCNT nanoparticles, and the maximum increase was registered at 0.05% SWCNT volume fraction. The mixture temperature is increased with the axial distance of the pipe but a reduction in temperature distribution is observed with the increasing SWCNT volume fraction, which reflects the effect of thermophysical properties of the mixture.
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Authors and Affiliations

Farqad Rasheed Saeed
1
Marwah A. Jasim
2
Natheer B. Mahmood
3
Zahraa M. Jaffar
4
  1. Ministry of Science Technology, Directorate of Materials Research, 55509 Al-Jadriya, Iraq
  2. University of Baghdad, College of Engineering, Al-Jadriya,10074 Al-Jadriya, Iraq
  3. Ministry of Education, General Directorate of Baghdad Education, Karkh 2, 10072 Al-Jadriya, Iraq
  4. Al Nahrain University, College of Science, 10072 Al-Jadriya, Iraq

Analysis of selected aspects of a tank gassing-up process on board liquefied petroleum gas carrier. Part I

Agnieszka Wieczorek
Archives of Thermodynamics | 2021 | vol. 42 | No 2 | 43-58 | DOI: 10.24425/ather.2021.137552
Keywords Convective heat transfer Reynolds number nanofluid single wall carbon nanotube SWCNT laminar flow
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Abstract

The paper is a thermodynamics analysis of the removal of any inert gas from the tank using the vapors of any liquefied petroleum gas cargo (called cargo tank gassing-up operation). For this purpose, a thermodynamic model was created which considers two boundary cases of this process. The first is a ‘piston pushing’ of inert gas using liquefied petroleum gas vapour. The second case is complete mixing of both gases and removal the mixture from the tank to the atmosphere until desired concentration or amount of liquefied petroleum gas cargo in the tank is reached. Calculations make it possible to determine the amount of a gas used to complete the operation and its loss incurred as a result of total mixing of both gases.
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Authors and Affiliations

Agnieszka Wieczorek
1
  1. Gdynia Maritime University, Morska 81–87, 81-225 Gdynia, Poland

Numerical investigation for convective heat transfer of nanofluid laminar flow inside a circular pipe by applying various models

Farqad Rasheed Saeed Marwah Abdulkareem Al-Dulaimi
Archives of Thermodynamics | 2021 | vol. 42 | No 1 | 71-95 | DOI: 10.24425/ather.2021.136948
Keywords Convective heat transfer Reynolds number Nanofluid Single-phase flow thermophysical properties
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Abstract

The work presents a numerical investigation for the convective heat transfer of nanofluids under a laminar flow inside a straight tube. Different models applied to investigate the improvement in convective heat transfer, and Nusselt number in comparison with the experimental data. The impact of temperature dependence, temperature independence, and Brownian motion, was studied through the used models. In addition, temperature distribution and velocity field discussed through the presented models. Various concentrations of nanoparticles are used to explore the results of each equation with more precision. It was shown that achieving the solution through specific models could provide better consistency between obtained results and experimental data than the others.
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Bibliography

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[4] Choi S.U.S., Eastman J.A.: Enhancing thermal conductivity of fluids with nanoparticles. Argonne National Lab., ANL/MSD/CP-84938, CONF-951135-29, 1995.
[5] Daungthongsuk W., Wongwises S.: A critical review of convective heat transfer of nanofluids. Renew. Sustain. Energy Rev. 11(2007), 5, 797–817.
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Authors and Affiliations

Farqad Rasheed Saeed
1
Marwah Abdulkareem Al-Dulaimi
  1. Ministry of Science and Technology, Directorate of Materials Research, 55509 Al-Jadriya, Iraq

Exergy based analysis of solar air heater duct with W-shaped rib roughness on the absorber plate

Sumer Singh Patel Atul Lanjewar
Archives of Thermodynamics | 2019 | vol. 40 | No 4 | 21-48 | DOI: 10.24425/ather.2019.130006
Keywords Solar air heater W-shape rib Exergetic efficiency Reynolds number Thermal efficiency Temperature rise parameter
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Abstract

Exergy analysis is a powerful thermodynamic tool and it helps in computing the actual output of a system. It helps the researchers to optimize the roughened solar air heater design to compensate the present and also the future needs. In this study, investigation on exergetic performance evaluation of a solar air heater with W-shaped roughened absorber surface analytically by employing mathematical model and the results obtained are compared with smooth plate solar air heater under same operating conditions. The exergetic efficiency curves has been plotted as a function of different values of Reynolds number and temperature rise parameter for different roughness parameters. The maximum augmentation in the exergetic efficiency of the solar air heater with W-shaped roughened surface as compared to solar air heater with smooth surface has been obtained as 51% corresponding to the relative roughness height of 0.03375 and the rib angle of attack about 60◦. Based on the exergetic efficiency the suitable design parameters of solar air heater with W-shaped roughened are determined.

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Authors and Affiliations

Sumer Singh Patel
Atul Lanjewar

Numerical investigation and sensitivity analysis of entropy generation of Al2O3/H2O nanofluid in turbulent regime using response surface methodology

O.G. Fadodun B.A. Olokuntoye A.O. Salau Adebimpe A. Amosun
Archives of Thermodynamics | 2020 | vol. 41 | No 2 | 119-146 | DOI: 10.24425/ather.2020.133625
Keywords Entropy production Reynolds number Response-surface-methodology Nanofluid Single-phase flow
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Abstract

This work investigates the effect of Reynolds number, nanoparticle volume ratio, nanoparticle size and entrance temperature on the rate of entropy generation in Al2O3 /H2O nanofluid flowing through a pipe in the turbulent regime. The Reynolds average Navier-Stokes and energy equations were solved using the standard k-ε turbulent model and the central composite method was used for the design of experiment. Based on the number of variables and levels, the condition of 30 runs was defined and 30 simulations were run. The result of the regression model obtained showed that all the input variables and some interaction between the variables are statistically significant to the entropy production. Furthermore, the sensitivity analysis result shows that the Reynolds number, the nanoparticle volume ratio and the entrance temperature have negative sensitivity while the nanoparticle size has positive sensitivity.

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Authors and Affiliations

O.G. Fadodun
B.A. Olokuntoye
A.O. Salau
Adebimpe A. Amosun

Heat transfer and friction characteristics in three-side solar air heaters with the combination of multi-v and transverse wire roughness

Dhananjay Kumar
Archives of Thermodynamics | 2023 | vol. 44 | No 1 | 63-87 | DOI: 10.24425/ather.2023.145877
Keywords Absorber plate Fluid flow Heat transfer Solar air heater Reynolds number Relative roughness height
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Abstract

The present paper describes the experimental analysis of heat transfer and friction factor for glass protected three-side artificially roughened rectangular duct solar air heaters (SAHs) having an arrangement of multiple-v and transverse wires (top wall multi-v and two side walls transverse) under the absorber plate, and compares their performance with that of one-side roughened solar air heaters under similar operating conditions. The investigated three-side solar air heaters are characterized by a larger rate of heat transfer and friction factor as compared to one-side artificially roughened SAHs by 24–76% and 4–36%, respectively, for the identical operating parameters. The air temperature below the three-side rugged duct is by 34.6% higher than that of the one-side roughened duct. Three-side solar air heaters are superior as compared to one-side artificially roughened solar air heaters qualitatively and quantitatively both.
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Authors and Affiliations

Dhananjay Kumar
1
  1. B.A. College of Engineering and Technology, Ghutia, P.O. Barakhurshi Jamshedpur, Jharkhand 832304, India

Numerical investigation and sensitivity analysis of turbulent heat transfer and pressure drop of Al2O3/H2O nanofluid in straight pipe using response surface methodology

Olatomide G. Fadodun Adebimpe A. Amosun Ayodeji O. Salau David O. Olaloye Johnson A. Ogundeji Francis I. Ibitoye Fatai A. Balogun
Archives of Thermodynamics | 2020 | vol. 41 | No 1 | 3-30 | DOI: 10.24425/ather.2020.132948
Keywords Nusselt number Reynolds number pressure drop Response-surface-methodology Nanofluid Single-phase flow
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Abstract

In this paper, investigation of the effect of Reynolds number, nanoparticle volume ratio, nanoparticle diameter and entrance temperature on the convective heat transfer and pressure drop of Al2O3/H2O nanofluid in turbulent flow through a straight pipe was carried out. The study employed a computational fluid dynamic approach using single-phase model and response surface methodology for the design of experiment. The Reynolds average Navier-Stokes equations and energy equation were solved using k-" turbulent model. The central composite design method was used for the response-surface-methodology. Based on the number of variables and levels, the condition of 30 runs was defined and 30 simulations were performed. New models to evaluate the mean Nusselt number and pressure drop were obtained. Also, the result showed that all the four input variables are statistically significant to the pressure drop while three out of them are significant to the Nusslet number. Furthermore, sensitivity analysis carried out showed that the Reynolds number and volume fraction have a positive sensitivity to both the mean Nusselt number, and pressure drop, while the entrance temperature has negative sensitivities to both.

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Authors and Affiliations

Olatomide G. Fadodun
Adebimpe A. Amosun
Ayodeji O. Salau
David O. Olaloye
Johnson A. Ogundeji
Francis I. Ibitoye
Fatai A. Balogun

Heat transfer study from square cylinder immersed in water-based nanofluid: Effect of orientation

Jaspinder Kaur Jatinder Kumar Ratan Anurag Kumar Tiwari
Chemical and Process Engineering | 2022 | vol. 43 | No 2 (The International Chemical Engineering Conference 2021 (ICHEEC): 100 Glorious Years of Chemical Engineering and Technology, held from September 16–19, 2021 at Dr B. R. Ambedkar National Institute of Technology, Jalandhar, Punjab, India. Guest editor: Dr Raj Kumar Arya, Dr Anurag Kumar Tiwari) | 243-250 | DOI: 10.24425/cpe.2022.140827
Keywords inclined square cylinder nanofluids Reynolds number Prandtl number steady flow regime
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Abstract

Heat transfer study from the heated square cylinder at a different orientation angle to the stream of nanofluids has been investigated numerically. CuO-based nanofluids were used to elucidate the significant effect of parameters: Reynolds number (1–40), nanoparticle volume fraction (0.00–0.05), the diameter of the NPs (30–100 mn) and the orientation of square cylinder (0–90°). The numerical results were expressed in terms of isotherm contours and average Nusselt number to explain the effect of relevant parameters. Over the range of conditions, the separation of the boundary layers of nanofluids increased with the size of the NPs as compared to pure water. NPs volume fraction and its size had a significant effect on heat transfer rate. The square cylinder of orientation angle (45°) gained a more efficient heat transfer cylinder than other orientation angles. Finally, the correlations were developed for the average Nusselt number in terms of the relevant parameters for 45° orientation of the cylinder for new applications.
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Authors and Affiliations

Jaspinder Kaur
1
Jatinder Kumar Ratan
1
Anurag Kumar Tiwari
1
  1. Dr B.R. Ambedkar National Institute of Technology Jalandar Punjab, Chemical Engineering Department, Pin code 144011, India

Identification of longitudinal aerodynamic characteristics of a strake-wing micro aerial vehicle by using artificial neural networks

Dariusz Rykaczewski Mirosław Nowakowski Krzysztof Sibilski Wiesław Wróblewski Michał Garbowski
Bulletin of the Polish Academy of Sciences Technical Sciences | 2021 | 69 | 4 | e137508 | DOI: 10.24425/bpasts.2021.137508
Keywords water tunnel measurements neural networks unsteady aerodynamic characteristics low Reynolds number aerodynamics
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Abstract

Appropriate modeling of unsteady aerodynamic characteristics is required for the study of aircraft dynamics and stability analysis, especially at higher angles of attack. The article presents an example of using artificial neural networks to model such characteristics. The effectiveness of this approach was demonstrated on the example of a strake-wing micro aerial vehicle. The neural model of unsteady aerodynamic characteristics was identified from the dynamic test cycles conducted in a water tunnel. The aerodynamic coefficients were modeled as a function of the flow parameters. The article presents neural models of longitudinal aerodynamic coefficients: lift and pitching moment as functions of angles of attack and reduced frequency. The modeled and trained aerodynamic coefficients show good consistency. This method manifests great potential in the construction of aerodynamic models for flight simulation purposes
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Authors and Affiliations

Dariusz Rykaczewski
ORCID: ORCID
Mirosław Nowakowski
ORCID: ORCID
Krzysztof Sibilski
ORCID: ORCID
Wiesław Wróblewski
ORCID: ORCID
Michał Garbowski

Performance analysis of three sides solar air heater having roughness elements as a combination of multiple-v and transverse wire on the absorber plate

Dhananjay Kumar Laljee Prasad
Archives of Thermodynamics | 2020 | vol. 41 | No 3 | 125-143 | DOI: 10.24425/ather.2020.134575
Keywords Reynolds number Relative roughness height Relative roughness pitch Solar air heater Thermal efficiency One side roughened duct Three side's roughened duct
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Abstract

Artificial roughness has been found to enhance the thermal performance from the collector to air in the solar air heater duct. This paper presents the results of experimental investigation on thermal performance of three sides solar air heater roughened with combination of multiple-v and transverse wire. The range of variation of system and operating parameters is investigated within the limits of relative roughness pitch of 10−25, relative roughness height of 0.018−0.042, angle of attack of 30°−75° at varying flow Reynolds number in the of range of 3000−12000 for fixed value of relative roughness width of 6. The augmentation in fluid temperature flowing under three side’s roughened duct is found to be 36.57% more than that of one side roughened duct. The maximum thermal efficiency is obtained at relative roughness pitch of 10 and relative roughness height of 0.042, and angle of attack of 60°. The augmentation in thermal efficiency of three sides over those of one side roughened duct is found to be 46−57% for varying values of relative roughness pitch, 38−50% for varying values of relative roughness height, and 40−46% for varying values of angle of attack.

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Authors and Affiliations

Dhananjay Kumar
Laljee Prasad

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