Log in

Relevant bibliographies by topics / (Re); Nusselt number / Journal articles

To see the other types of publications on this topic, follow the link: (Re); Nusselt number.

Journal articles on the topic '(Re); Nusselt number'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic '(Re); Nusselt number.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Van den Bulck, E. "The Nonlinear Increase of Nusselt Number With Friction Factor in Fully Developed Laminar Duct Flow." Journal of Heat Transfer 126, no. 5 (2004): 840–42. http://dx.doi.org/10.1115/1.1800511.

Full text

Abstract:

This paper deals with heat transfer in fully developed laminar flow in cylindrical ducts. For this type of flow, the product of friction factor with Reynolds number f Re and the Nusselt number are both constants. It is known that the Nusselt number increases with the shift of boundary condition from constant wall temperature to constant heat flux. Also, the ratio of the Nusselt number to f Re increases when the convexity of the duct is reduced, e.g., a cylinder visavis parallel plates. This paper gives a simple physical explanation for these two phenomenona.

APA, Harvard, Vancouver, ISO, and other styles

2

Shaikh Sohel Mohd Khalil, Rai Sujit Nath Sahai, Nitin Parashram Gulhane, Khizar Ahmed Pathan, Ajaj Rashid Attar, and Sher Afghan Khan. "Experimental Investigation of Local Nusselt Profile Dissemination to Augment Heat Transfer under Air Jet Infringements for Industrial Applications." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 112, no. 2 (2024): 161–73. http://dx.doi.org/10.37934/arfmts.112.2.161173.

Full text

Abstract:

An experimental study is presented in this paper to evaluate the enhancement of heat transfer characteristics. This includes the study of a steady air jet impinging on a planar aluminum plate with constant heat flux. Extensive industrial applications of heat transfer include electronic heat sinks, the food industry, automobiles, and heat exchangers. The magnitude of the local Nusselt number along the streamwise direction is determined through detailed experimental computation using the infrared radiometry technique. The range of Reynolds number was selected between 6500 ≤ Re ≤ 15000 and the ai

APA, Harvard, Vancouver, ISO, and other styles

3

Su, Duan, He, Ma, and Xu. "Thermally Developing Flow and Heat Transfer in Elliptical Minichannels with Constant Wall Temperature." Micromachines 10, no. 10 (2019): 713. http://dx.doi.org/10.3390/mi10100713.

Full text

Abstract:

Laminar convective heat transfer of elliptical minichannels is investigated for hydrodynamically fully developed but thermal developing flow with no-slip condition. A three-dimensional numerical model is developed in different elliptical geometries with the aspect ratio varying from 0.2 to 1. The effect of Reynolds number (25 ≤ Re ≤ 2000) on the local Nusselt number is examined in detail. The results indicate that the local Nusselt number is a decreasing function of Reynolds number and it is sensitive to Reynolds number especially for Re less than 250. The effect of aspect ratio on local Nusse

APA, Harvard, Vancouver, ISO, and other styles

4

Tzeng, Sheng Chung. "Convective Heat Transfer in a Rectangular Channel Filled With Sintered Bronze Beads and Periodically Spaced Heated Blocks." Journal of Heat Transfer 128, no. 5 (2005): 453–64. http://dx.doi.org/10.1115/1.2175151.

Full text

Abstract:

This work numerically investigated the steady state fluid flow and heat transfer behaviors associated with a sintered porous channel that contains periodically spaced heated blocks. Some typical cases are experimentally examined in this study. The relevant varied parameters were the average bead diameter (d), the relative block height (h∕H), the relative block width (w∕H), the relative block spacing (s∕H), and the Reynolds number (Re). The numerical results revealed a lack of global recirculation in regions between the blocks, where the forced convective heat transfer was low, but the heat in

APA, Harvard, Vancouver, ISO, and other styles

5

Xiong, Ting, Chenchen Chen, Yong Chen, and Zhenlong Fang. "Numerical study of the momentum and heat transfer between an oblate ellipsoid and a gas in uniform flow." Journal of Physics: Conference Series 2569, no. 1 (2023): 012058. http://dx.doi.org/10.1088/1742-6596/2569/1/012058.

Full text

Abstract:

Abstract In this study, drag coefficient (cd ) and Nusselt number (Nu) for oblate ellipsoids with different incident angles (θ) and particle aspect ratios (Ar) in uniform flow have been computed over a wide range of Re ∈[10,500]. Finally, a new drag coefficient correlation is proposed, which covers a wider range of oblate ellipsoids. Surprisingly, we observe that the incident angle has a negligible effect on the Nusselt number for the oblate ellipsoids in the Reynolds number range studied. The Nusselt number for oblate ellipsoids with incident angle (θ) can be approximated accurately by the av

APA, Harvard, Vancouver, ISO, and other styles

6

Martin, Elena, Alejandro Valeije, Francisco Sastre, and Angel Velazquez. "Impact of Channels Aspect Ratio on the Heat Transfer in Finned Heat Sinks with Tip Clearance." Micromachines 13, no. 4 (2022): 599. http://dx.doi.org/10.3390/mi13040599.

Full text

Abstract:

A 3D numerical study is used to analyze the flow topology and performance, in terms of heat transfer efficiency and required pumping power, of heat sink devices with different channel aspect-ratio in the presence of tip-clearance. Seven different channel aspect ratios AR, from 0.25 to 1.75, were analyzed. The flow Reynolds numbers Re, based on the average velocity evaluated in the device channels region, were in the range of 200 to 1000. Two different behaviors of the global Nusselt were obtained depending on the flow Reynolds number: for Re<600, the heat transfer increased with the channel

APA, Harvard, Vancouver, ISO, and other styles

7

Taler, Dawid. "Semi-empirical heat transfer correlations for turbulent tube flow of liquid metals." International Journal of Numerical Methods for Heat & Fluid Flow 28, no. 1 (2018): 151–72. http://dx.doi.org/10.1108/hff-09-2017-0367.

Full text

Abstract:

Purpose The purpose of this paper is to develop new semi-empirical heat transfer correlations for turbulent flow of liquid metals in the tubes, and then to compare these correlations with the experimental data. The Prandtl and Reynolds numbers can vary in the ranges: 0.0001 ≤ Pr ≤ 0.1 and 3000 ≤ Re ≤ 106. Design/methodology/approach The energy conservation equation averaged by Reynolds was integrated using the universal velocity profile determined experimentally by Reichardt for the turbulent tube flow and four different models for the turbulent Prandtl number. Turbulent heat transfer in the c

APA, Harvard, Vancouver, ISO, and other styles

8

Alexandrova, Silvia, Maria Karsheva, Abdellah Saboni, and Christophe Gourdon. "Heat transfer from a moving fluid sphere with internal heat generation." Thermal Science 18, no. 4 (2014): 1213–22. http://dx.doi.org/10.2298/tsci120811054a.

Full text

Abstract:

In this work, we solve numerically the unsteady conduction-convection equation including heat generation inside a fluid sphere. The results of a numerical study in which the Nusselt numbers from a spherical fluid volume were computed for different ranges of Reynolds number (0<Re<100), Peclet number (0<Pe<10000) and viscosity ratio (0<k<10), are presented. For a circulating drop with Re?0, steady creeping flow is assumed around and inside the sphere. In this case, the average temperatures computed from our numerical analysis are compared with those from literature and a very g

APA, Harvard, Vancouver, ISO, and other styles

9

Al-Kouz, Wael, Rafat Al-Waked, Ma’en Sari, Wahib Owhaib, and Anas Atieh. "Numerical study of heat transfer enhancement in the entrance region for low-pressure gaseous laminar pipe flows using Al2O3–air nanofluid." Advances in Mechanical Engineering 10, no. 7 (2018): 168781401878441. http://dx.doi.org/10.1177/1687814018784410.

Full text

Abstract:

The gaseous low-pressure nanofluid flow of a steady-state two-dimensional laminar forced convection heat transfer in the entrance region of pipes is numerically investigated. Such flows are of interest for many engineering applications like the nuclear reactor and electronic equipment cooling, heat exchangers, and many others. Physical parameters considered in this study are Reynolds number ( Re), Prandtl number ( Pr), nanosolid particles volume fraction [Formula: see text], Knudsen number ( Kn), and the aspect ratio ( AR). These parameters ranges are as follows: [Formula: see text], [Formula:

APA, Harvard, Vancouver, ISO, and other styles

10

Thani, Mohammed, and Muneer Ismael. "Numerical Study of Jet Impingement on Heated Sink Covered by a Porous Layer." Basrah journal for engineering science 22, no. 2 (2022): 1–9. http://dx.doi.org/10.33971/bjes.22.2.1.

Full text

Abstract:

This numerical study aims to enhance the heat transfer efficiency by dissipating the heat Emitted from electronic processors. A jet impingement technique is utilized with porous layer covering a metal fin as a heat sink. Forced convection and normal convection (due to the buoyancy effect) are taken into consideration. The two equations model (Local Thermal Non-Equilibrium LTNE) employed to describe the energy equations of the two phases of the porous surface. Finite Element Method (FEM) used to discretize these equations to obtain the numerical solution. To make this study closest to the reali

APA, Harvard, Vancouver, ISO, and other styles

11

Im, Sanghyuk, Hyun Woo Cho, Kyeongsoo Kim, Man Yeong Ha, and Yong Gap Park. "Effects of the Wavelength for the Sinusoidal Cylinder and Reynolds Number for Three-Dimensional Mixed Convection." Energies 16, no. 6 (2023): 2550. http://dx.doi.org/10.3390/en16062550.

Full text

Abstract:

A numerical study estimated the mixed convection around a sinusoidal cylinder inside a rectangular cavity. The key parameters for sinusoidal circular cylinders were the wavelength and Reynolds number (Re = 100, 500, and 1000) with a fixed Prandtl number of 0.7. The flow regimes were greatly affected by these parameters. The unsteadiness of the flow pattern was also affected by λ and Re. The results were analyzed by the thermal structure, vortical structure, and Nusselt number. Furthermore, the orthogonal enstrophy was used to quantify the three-dimensional flow characteristics, and the frequen

APA, Harvard, Vancouver, ISO, and other styles

12

Zheng, Dan, Zhenwei Hu, Liting Tian, Jin Wang, and Bengt Sundén. "What dominates heat transfer performance of a double-pipe heat exchanger." Open Physics 19, no. 1 (2021): 863–66. http://dx.doi.org/10.1515/phys-2021-0101.

Full text

Abstract:

Abstract ZnO–water nanofluid in an inner pipe was experimentally investigated to improve the thermal efficiency of double-pipe heat exchangers. In this work, a 57.6% increase in the Nusselt number was obtained at Re = 14,340 when the ZnO–water nanofluid flowed through a helically corrugated tube. It was found that helical corrugation played a more important role in heat transfer enhancement than thermophysical properties of the nanofluid at the Reynolds number below 10,221. In addition, with the increase of the Reynolds number, the advantages of nanofluids in thermal performance become obvious

APA, Harvard, Vancouver, ISO, and other styles

13

Adnan Abd, Ghassan. "Numerical Investigation of Heat Transfer and Fluid Flow a cross Circular and Elliptical Tube Bank." University of Thi-Qar Journal for Engineering Sciences 1, no. 2 (2010): 84–97. http://dx.doi.org/10.31663/utjes.v1i2.128.

Full text

Abstract:

In this study, a numerical investigation of heat transfer and fluid flow a cross circular and elliptical tube bank has been made then comparisons made between these two types. The study focus on the effect of Reynolds number and ellipse eccentricity on the Nusselt number and pressure drop through the tube bank for two arrangements (in-line and staggered). The results are reported for air and for Reynolds number range of 20≤Re≤500. The results of the study shows that Nusselt number increased as Reynolds number increased for all cases. The values of Nusselt number for elliptical tube are higher

APA, Harvard, Vancouver, ISO, and other styles

14

Hasan, Husam Abdulrasool, Jenan S. Sherza, Azher M. Abed, Hakim S. Sultan, and Kamaruzzaman Sopian. "Improve the performance of solar thermal collectors by varying the concentration and nanoparticles diameter of silicon dioxide." Open Engineering 12, no. 1 (2022): 743–51. http://dx.doi.org/10.1515/eng-2022-0339.

Full text

Abstract:

Abstract The influence of different concentrations and nanoparticles’ diameter of silicon dioxide nanoparticles on the Nusselt number enhancement ratio and friction factor for solar thermal collector (STC) was examined numerically. The CFD model was designed to show the influence of the flow of water/SiO2 and pure water inside the pipe on the enhancement of the performance of the STC. Different concentrations of SiO2 nanoparticles are used (ϕ = 1–4%) with several nanoparticle diameters (dp = 20–50 nm). The water/SiO2 and pure water flow under different Reynolds numbers ranging from 5,000 to 30

APA, Harvard, Vancouver, ISO, and other styles

15

Spall, R. E. "Observations of Spanwise Symmetry Breaking for Unsteady Mixed Convection in Horizontal Ducts." Journal of Heat Transfer 118, no. 4 (1996): 885–88. http://dx.doi.org/10.1115/1.2822584.

Full text

Abstract:

Three-dimensional mixed convection in a horizontal rectangular duct heated from below was studied numerically for a non-Boussinesq fluid. The duct was of aspect ratio four, with cold side-wall boundary conditions. Results were obtained at a reduced temperature of 2.33, Rayleigh number of 130,700, and Reynolds numbers of 5 and 20. Using the Re = 20 solution as initial conditions, the Re = 5 solution developed asymmetries about the duct centerline plane, with a streamwise periodic generation and dissolution of the inner pair of vortices. The consequence of these coherent vortical structures was

APA, Harvard, Vancouver, ISO, and other styles

16

Basit, Romana, Xinyang Li, Zheqing Huang, and Qiang Zhou. "Heat Transfer Studies of Arrays of Prolate Particles in Gas-Solid Flows." Mathematical Problems in Engineering 2020 (November 11, 2020): 1–12. http://dx.doi.org/10.1155/2020/6639172.

Full text

Abstract:

Numerical study of forced convection heat transfer from arrays of prolate particles is performed using the second-order Immersed Boundary-Lattice Boltzmann Method (IB-LBM). Prolate particle is studied with aspect ratio of 2.5 with solid volume fraction variation from 0.1 to 0.3. For each solid volume fraction, arrays of prolate particles are generated and simulations have been performed to calculate Nusselt number for four different Hermans orientation factors and various Reynolds numbers. From the simulation results, it has been observed that, for any specific value of Hermans orientation fac

APA, Harvard, Vancouver, ISO, and other styles

17

Izadikia, Maryam, Miralam Mahdi, and Kamran Mobini. "Numerical study of hydrodynamic and thermal behavior of Al2O3/Water nanofluid and Al2O3-Cu/Water hybrid nanofluid in a confined impinging slot jet using two-phase mixed model." Journal of Mechanical Engineering and Sciences 16, no. 2 (2022): 8917–30. http://dx.doi.org/10.15282/jmes.16.2.2022.09.0705.

Full text

Abstract:

This study utilizes the two-phase mixture model to conduct a numeric study of Al2O3/Water and Al2O3-Cu/Water (hybrid) nanofluid's hydrodynamic and thermal behavior in a laminar confined impinging slot jet in 50 ≤ Re ≤ 300 and nanoparticles volume fractions (NVF) ranging from 0 - 2%. This study considers various aspect ratios (H/W), including 2, 4, and 6, to investiate the confining effects. This paper gives a comparative analysis of nanofluids and hybrid nanofluids in terms of the parameters concerning the flow: Reynolds and local Nusselt number (Nux), average Nusselt number (Nuavg), flow line

APA, Harvard, Vancouver, ISO, and other styles

18

Oni, Taiwo O. "CFD Study of Behavior of Transition Flow in Distinct Tubes of Miscellaneous Tape Insertions." HighTech and Innovation Journal 3, no. 2 (2022): 130–39. http://dx.doi.org/10.28991/hij-2022-03-02-02.

Full text

Abstract:

Application of transition flow can be found in several processes and systems. It has been revealed through findings from various researchers that the values of Reynolds numbers at which transition flow occurs vary. In the current work, investigations were numerically conducted by Fluent on transition of water flow in three assorted plain tubes fitted with miscellaneous tape insertions. They are plain tube with crossed-axes-circle-cut tape insert (C-C tube), plain tube with crossed-axes-triangle-cut tape insert (C-T tube), and plain tube with crossed-axes-ellipse-cut tape insert (C-E tube). The

APA, Harvard, Vancouver, ISO, and other styles

19

Qiang, Yan, Liejiang Wei, Xiaomei Luo, Hongchao Jian, Wenan Wang, and Fenfen Li. "Heat Transfer and Flow Structures of Laminar Confined Slot Impingement Jet with Power-Law Non-Newtonian Fluid." Entropy 20, no. 10 (2018): 800. http://dx.doi.org/10.3390/e20100800.

Full text

Abstract:

Heat transfer performances and flow structures of laminar impinging slot jets with power-law non-Newtonian fluids and corresponding typical industrial fluids (Carboxyl Methyl Cellulose (CMC) solutions and Xanthangum (XG) solutions) have been studied in this work. Investigations are performed for Reynolds number Re less than 200, power-law index n ranging from 0.5 to 1.5 and consistency index K varying from 0.001 to 0.5 to explore heat transfer and flow structure of shear-thinning fluid and shear-thickening fluid. Results indicate that with the increase of n, K for a given Re, wall Nusselt numb

APA, Harvard, Vancouver, ISO, and other styles

20

Jeng, Tzer-Ming, and Sheng-Chung Tzeng. "Study of Flow and Heat Transfer Characteristics in Asymmetrically Heated Sintered Porous Heat Sinks With Periodical Baffles." Journal of Electronic Packaging 128, no. 3 (2005): 226–35. http://dx.doi.org/10.1115/1.2229220.

Full text

Abstract:

This work numerically examined the mechanism of heat transfer in a sintered porous heat sink with baffles. A channel filled with the sintered porous heat sink was asymmetrically heated and metallic baffles were periodically mounted on the heated surface. The fluid medium was air. The results indicate that no recirculation occurred between baffles. The metallic baffle obtained heat from the heated surface by conduction directly from the heated surface and indirectly through the porous media. It dissipated heat to the fluid that passed over the zone above the baffle. The Nusselt numbers in the c

APA, Harvard, Vancouver, ISO, and other styles

21

Stevens, J., and B. W. Webb. "Local Heat Transfer Coefficients Under an Axisymmetric, Single-Phase Liquid Jet." Journal of Heat Transfer 113, no. 1 (1991): 71–78. http://dx.doi.org/10.1115/1.2910554.

Full text

Abstract:

The purpose of this investigation was to characterize local heat transfer coefficients for round, single-phase free liquid jets impinging normally against a flat uniform heat flux surface. The problem parameters investigated were jet Reynolds number Re, nozzle-to-plate spacing z, and jet diameter d. A region of near-constant Nusselt number was observed for the region bounded by 0≤r/d≤0.75, where r is the radial distance from the impingement point. The local Nusselt number profiles exhibited a sharp drop for r/d > 0.75, followed by an inflection and a slower decrease there-after. Increasing

APA, Harvard, Vancouver, ISO, and other styles

22

Nath, Dipjyoti, Sukumar Pati, and B. Hema Sundar Raju. "Analysis of mixed convection past a heated sphere." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 233, no. 3 (2018): 601–16. http://dx.doi.org/10.1177/0954408918780511.

Full text

Abstract:

The hydrodynamic and thermal characteristics for laminar axisymmetric mixed convection from a heated sphere are analyzed numerically in this work. The governing transport equations of conservation of mass, momentum, and energy have been solved using a higher order compact scheme. The results are presented in terms of the distribution of the streamlines, isotherms, and vorticity contours, and local Nusselt number along the sphere surface together with drag coefficient and average Nusselt number. We identify critical Richardson number above which separation of flow is suppressed. It is revealed

APA, Harvard, Vancouver, ISO, and other styles

23

Ali, Kashif, Shabbir Ahmad, Sohail Ahmad, Wasim Jamshed, Syed M. Hussain, and El Sayed M. Tag El Din. "Molecular Interaction and Magnetic Dipole Effects on Fully Developed Nanofluid Flowing via a Vertical Duct Applying Finite Volume Methodology." Symmetry 14, no. 10 (2022): 2007. http://dx.doi.org/10.3390/sym14102007.

Full text

Abstract:

Interpreting the complex interaction of nanostructured fluid flow with a dipole in a duct, with peripherally uniform temperature distribution, is the main focus of the current work. This paper also sheds light on the changes in the Nusselt number, temperature profiles, and velocity distributions for the fully developed nanofluid flow in a vertical rectangular duct due to a dipole placed near a corner of the duct. A finite volume approach has been incorporated for the numerical study of the problem. It is interesting to note the unusually lower values of the Nusselt number for the higher values

APA, Harvard, Vancouver, ISO, and other styles

24

Won, S. Y., N. K. Burgess, S. Peddicord, and P. M. Ligrani. "Spatially Resolved Surface Heat Transfer for Parallel Rib Turbulators With 45 Deg Orientations Including Test Surface Conduction Analysis." Journal of Heat Transfer 126, no. 2 (2004): 193–201. http://dx.doi.org/10.1115/1.1668046.

Full text

Abstract:

Spatially resolved Nusselt numbers, spatially-averaged Nusselt numbers, and friction factors are presented for a stationary channel with an aspect ratio of 4 and angled rib turbulators inclined at 45 deg with parallel orientations on two opposite surfaces. Results are given at different Reynolds numbers based on channel height from 9000 to 76,000. The ratio of rib height to hydraulic diameter is 0.078, the rib pitch-to-height ratio is 10, and the blockage provided by the ribs is 25 percent of the channel cross-sectional area. Nusselt numbers are determined with three-dimensional conduction con

APA, Harvard, Vancouver, ISO, and other styles

25

Kaur, Jaspinder, Roderick Melnik, and Anurag Kumar Tiwari. "Forced convection heat transfer study of a blunt-headed cylinder in non-Newtonian power-law fluids." International Journal of Chemical Reactor Engineering 19, no. 7 (2021): 673–88. http://dx.doi.org/10.1515/ijcre-2020-0170.

Full text

Abstract:

Abstract In this present work, forced convection heat transfer from a heated blunt-headed cylinder in power-law fluids has been investigated numerically over the range of parameters, namely, Reynolds number (Re): 1–40, Prandtl number (Pr): 10–100 and power-law index (n): 0.3–1.8. The results are expressed in terms of local parameters, like streamline, isotherm, pressure coefficient, and local Nusselt number and global parameters, like wake length, drag coefficient, and average Nusselt number. The length of the recirculation zone on the rear side of the cylinder increases with the increasing va

APA, Harvard, Vancouver, ISO, and other styles

26

Iachachene, Farida, Amina Mataoui, and Yacine Halouane. "Steady interaction of a turbulent plane jet with a rectangular heated cavity." Thermal Science 20, no. 5 (2016): 1485–98. http://dx.doi.org/10.2298/tsci131106060i.

Full text

Abstract:

Turbulent heat transfer between a confined jet flowing in a hot rectangular cavity is studied numerically by finite volume method using the k-w SST one point closure turbulence model. The location of the jet inside the cavity is chosen so that the flow is in the non-oscillation regime. The flow structure is described for different jet-to-bottom-wall distances. A parametrical study was conducted to identify the influence of the jet exit location and the Reynolds number on the heat transfer coefficient. The parameters of this study are: the jet exit Reynolds number (Re, 1560< Re <33333), t

APA, Harvard, Vancouver, ISO, and other styles

27

Ali, Rashid, and Nadeem Hasan. "Analysis of Flow Structures and Global Parameters across a Heated Square Cylinder in Forced and Mixed Convection." Atmosphere 14, no. 1 (2022): 22. http://dx.doi.org/10.3390/atmos14010022.

Full text

Abstract:

In the present study, numerical simulations are performed to identify the role of Reynolds number (Re), Richardson number (Ri) and free-stream orientations (α) on flow structures, aerodynamic parameters and heat transfer characteristics for the conditions (20 ≤ Re ≤ 120, 0° ≤ α ≤ 90° and 0 ≤ Ri ≤ 1.6). Prandtl number (Pr) and cylinder orientation (ϕ) are kept fixed at 0.71 and 0°. The Oberbeck–Boussinesq approximation is used to account for buoyancy effects. The governing equations of continuity, momentum and energy are discretized on a colocated body-fitted grid by employing a finite differen

APA, Harvard, Vancouver, ISO, and other styles

28

Chen, Qing, Xiaobing Zhang, and Junfeng Zhang. "Effects of Reynolds and Prandtl Numbers on Heat Transfer Around a Circular Cylinder by the Simplified Thermal Lattice Boltzmann Model." Communications in Computational Physics 17, no. 4 (2015): 937–59. http://dx.doi.org/10.4208/cicp.2014.m314.

Full text

Abstract:

AbstractIn this paper, the fluid flow and heat transfer around a circular cylinder are studied under various conditions (Reynolds number 10 <Re< 200; Prandtl number, 0.1 ≤Pr≤ 2). To solve the governing equations, we use the simplified thermal lattice Boltzmann model based on double-distribution function approach, and present a corresponding boundary treatment for both velocity and temperature fields. Extensive numerical results have been obtained to the flow and heat transfer behaviors. The vortices and temperature evolution processes indicate that the flow and temperature fields change

APA, Harvard, Vancouver, ISO, and other styles

29

Boukerma, Karima, and Mahfoud Kadja. "Investigation of the effect of nanoparticle shape on fluid flow and heat transfer performance of Al2O3-EG-H2O nanofluids: cases of a fixed Reynolds number and a fixed velocity at inlet." Brazilian Journal of Technology 7, no. 1 (2024): 45–65. http://dx.doi.org/10.38152/bjtv7n1-004.

Full text

Abstract:

This study considers the shape effect of Al2O3 nanoparticles (platelets, blades,cylindrical and bricks) dispersed in an ethylene glycol-water base fluid (50-50%) on heat transfer and fluid flow. We have considered two different entry conditions: a constant Reynolds number (Re = 250) and a constant inlet velocity (Win=0.2 m/s).The physical model was developed using Gambit CFD for mesh and FLUENT for fluid flow modeling. The three-dimensional continuity, Navier–Stokes and energy equations are solved by using the finite volume method. We found that for Re = 250, the nanofluids with nanoparticles

APA, Harvard, Vancouver, ISO, and other styles

30

Elbakhshawangy, Hesham F., Abdelfatah Abdelmaksoud, and Osama S. Abd El-Kawi. "Flow and heat transfer characteristics of a nanofluid as the coolant in a typical MTR core." Kerntechnik 87, no. 1 (2022): 48–58. http://dx.doi.org/10.1515/kern-2021-1020.

Full text

Abstract:

Abstract The purpose of this work was to perform a thermal–hydraulic numerical analysis of a nanofluid as the coolant in a typical MTR (material testing reactor) core. Numerical simulation was carried out for turbulent flow of water based nanofluid of different concentrations of Al2O3 nanoparticles through a sub-channel of a typical MTR core subjected to cosine shape heat flux at various values of Reynolds number using the Ansys-Fluent computer code. The optimum performance of the studied nanofluid as a coolant in MTR core was determined by the determination of the conditions under which the t

APA, Harvard, Vancouver, ISO, and other styles

31

Mioralli, P. C., V. L. Scalon, E. Avallone, and S. A. Verdério Jr. "ANALYSIS OF LAMINAR FORCED CONVECTION INSIDE A SQUARE VENTILATED CAVITY USING THE OPENFOAM®." Revista de Engenharia Térmica 16, no. 1 (2017): 66. http://dx.doi.org/10.5380/reterm.v16i1.62193.

Full text

Abstract:

Laminar forced convection inside a square cavity with inlet and outlet ports was numerically analyzed. The positions of the inlet and outlet ports were fixed and the ports sizes were equal 25% of the side wall. The influence of the Reynolds and Prandtl numbers on the flow and temperature fields inside the cavity was verified for nine cases, with Re = 50, 100 and 500 and Pr = 0.7, 3 and 5. The heat transfer process in the cavity was analyzed from obtained values for the average Nusselt number and the local Nusselt number on the walls. The open source computer package OpenFOAM® was used for simu

APA, Harvard, Vancouver, ISO, and other styles

32

Mohammed, Hussein A., Nur Irmawati Om, and Mazlan A. Wahid. "Effect of Inclination Angle on Three-Dimensional Combined Convective Heat Transfer of Nanofluids in Rectangular Channels." Applied Mechanics and Materials 388 (August 2013): 176–84. http://dx.doi.org/10.4028/www.scientific.net/amm.388.176.

Full text

Abstract:

Combined convective nanofluids flow and heat transfer in an inclined rectangular duct is numerically investigated. Three dimensional, laminar Navier-Stokes and energy equations were solved using the finite volume method. Pure water and four types of nanofluids such as Au, CuO, SiO2 and TiO2with volume fractions range of 2% φ 7% are used. This investigation covers the following ranges: 2 × 106 Ra 2 × 107, 100 Re 1000 and 30° Θ 60°. The results revealed that the Nusselt number increased as Rayleigh number increased.SiO2nanofluid has the highest Nusselt number while Au nanofluid has the lowest Nu

APA, Harvard, Vancouver, ISO, and other styles

33

Mohamed, Hany A. "Effect of Rotation and Surface Roughness on Heat Transfer Rate to Flow through Vertical Cylinders in Steam Condensation Process." Journal of Heat Transfer 128, no. 3 (2005): 318–23. http://dx.doi.org/10.1115/1.2098862.

Full text

Abstract:

The enhancement in the rate of the heat transfer resulting from rotating smooth and rough vertical cylinders, of 1.28 and 21.75μm average roughness, respectively, are experimentally studied. Experiments were carried out for cooling fluid Reynolds numbers from 3300 to 7800 with varying the rotational speed up to 280rpm. Experimental runs at the stationary case showed an acceptable agreement with the theoretical values. The experimental Nusselt number values at various rotational speeds are correlated as functions of Reynolds, Weber, and Prandtl numbers for smooth and rough surfaces. The correla

APA, Harvard, Vancouver, ISO, and other styles

34

Kumar, Mukesh, and Arun Kumar. "Numerical simulation of roughened solar air heater on heat transfer augmentation and frictional flow characteristics in turbulent flow region." Engineering Research Express 4, no. 1 (2022): 015015. http://dx.doi.org/10.1088/2631-8695/ac4fb2.

Full text

Abstract:

Abstract This paper works on the numerical simulation of heat transfer augmentation and frictional flow characteristics in roughened Solar Air Heaters by using two-Dimensional CFD for a different type of rib shapes arrangement. The numerical simulation was performed with the RNG k-ε turbulence model in ANSYS 15 software. Aluminum and the air were expressed as absorber plate material and working fluid in the present analysis, respectively. The ‘second-order upwind’ approach was used for the momentum and energy equations. To couple velocity–pressure, the SIMPLE algorithm was used. For all residu

APA, Harvard, Vancouver, ISO, and other styles

35

Mashkour, Mahmoud A. "Analysis of transient mixed convection in a horizontal channel partially heated from below." Eastern-European Journal of Enterprise Technologies 4, no. 8(112) (2021): 16–22. http://dx.doi.org/10.15587/1729-4061.2021.238649.

Full text

Abstract:

The heat convection phenomenon has been investigated numerically (mathematically) for a channel located horizontally and partially heated at a uniform heat flux with forced and free heat convection. The investigated horizontal channel with a fluid inlet and the enclosure was exposed to the heat source from the bottom while the channel upper side was kept with a constant temperature equal to fluid outlet temperature. Transient, laminar, incompressible and mixed convective flow is assumed within the channel. Therefore, the flow field is estimated using Navier Stokes equations, which involves the

APA, Harvard, Vancouver, ISO, and other styles

36

Mahmoud, A. Mashkour. "Analysis of transient mixed convection in a horizontal channel partially heated from below." Eastern-European Journal of Enterprise Technologies 4, no. 8 (112) (2021): 16–22. https://doi.org/10.15587/1729-4061.2021.238649.

Full text

Abstract:

The heat convection phenomenon has been investigated numerically (mathematically) for a channel located horizontally and partially heated at a uniform heat flux with forced and free heat convection. The investigated horizontal channel with a fluid inlet and the enclosure was exposed to the heat source from the bottom while the channel upper side was kept with a constant temperature equal to fluid outlet temperature. Transient, laminar, incompressible and mixed convective flow is assumed within the channel. Therefore, the flow field is estimated using Navier Stokes equations, which involves the

APA, Harvard, Vancouver, ISO, and other styles

37

Anbarsooz, Morteza, and Hamid Niazmand. "Heat transfer characteristics of slip flow over solid spheres." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, no. 19 (2016): 3431–41. http://dx.doi.org/10.1177/0954406215612829.

Full text

Abstract:

In this study, heat transfer characteristics of slip flow over an isolated impermeable solid sphere are investigated numerically. An isothermal solid sphere is considered at intermediate Reynolds numbers (0 ≤ Re ≤ 50) for Prandtl numbers in the range of 0.7–7.0. The Navier–Stokes and energy equations are solved by a control volume technique in conjunction with the velocity slip and temperature jump boundary conditions. It was found that the size of the thermal wake region according to the Knudsen number depends on the Prandtl number. At lower Prandtl numbers (0.7 ≤ Pr ≤ 2.0), the thermal wake

APA, Harvard, Vancouver, ISO, and other styles

38

Kotšmíd, Stanislav, and Zuzana Brodnianská. "The Effect of Diameter and Position of Transverse Cylindrical Vortex Generators on Heat Transfer Improvement in a Wavy Channel." Mathematics 10, no. 23 (2022): 4546. http://dx.doi.org/10.3390/math10234546.

Full text

Abstract:

The present study investigates the effect of outer diameter (10 mm and 15 mm) and 5 positions of cylindrical vortex generators (CVGs) installed to the wavy channel in order to improve heat transfer parameters in conjunction with low-pressure drops. The wavy channels with and without CVGs are compared in terms of the local heat transfer coefficient, mean Nusselt number, Colburn factor, friction, and thermal performance for Re in the range of 857 to 8001. Furthermore, the effect of the cooling air flow direction (forward and backward) is assessed. Inserting the CVGs to the channel causes the enh

APA, Harvard, Vancouver, ISO, and other styles

39

Marimuthu, Muthukannan, Uthayakumar, Rajesh Kanna P, Paweł Ocłoń, Jan Taler, and Dawid Taler. "Effect of baffle shape in heat transfer for jet impingement on a solid block." MATEC Web of Conferences 240 (2018): 01025. http://dx.doi.org/10.1051/matecconf/201824001025.

Full text

Abstract:

The numerical solution solution is obtained for fluid flow and heat transfer in a confined impinging slot on a solid block with the presence of baffles. In order to consider the effect of baffle shape the rectangular and semi circular baffles are considered and for the effect for Reynolds number the Reynolds number is varied from 100 to 300 with the step of 50. The present study reveals the vital impact of Baffle shape and Reynolds number (Re) on the fluid flow and heat transfer characteristics over a wide range. It is finally added that the presence of baffle improves the Nusselt number. The

APA, Harvard, Vancouver, ISO, and other styles

40

Hudha, M. N., Md Jahid Hasan, T. Bairagi, A. K. Azad, and M. M. Rahman. "Artificial Neural Network analysis on the effect of mixed convection in triangular-shaped geometry using water-based Al2O3 nanofluid." PLOS ONE 19, no. 9 (2024): e0304826. http://dx.doi.org/10.1371/journal.pone.0304826.

Full text

Abstract:

The objective of the study is to investigate the fluid flow and heat transfer characteristics applying Artificial Neural Networks (ANN) analysis in triangular-shaped cavities for the analysis of magnetohydrodynamics (MHD) mixed convection with varying fluid velocity of water/Al2O3 nanofluid. No study has yet been conducted on this geometric configuration incorporating ANN analysis. Therefore, this study analyzes and predicts the complex interactions among fluid flow, heat transfer, and various influencing factors using ANN analysis. The process of finite element analysis was conducted, and the

APA, Harvard, Vancouver, ISO, and other styles

41

Hameed, Manar, Harith N. Mohammed, and Mohammed R. Abdullah. "Improving the Thermal Performance of a Heat Exchanger using a New Passive Technology." Tikrit Journal of Engineering Sciences 30, no. 1 (2023): 66–71. http://dx.doi.org/10.25130/tjes.30.1.6.

Full text

Abstract:

In this study, the oscillation technique was applied in a multi-tube heat exchanger with baffles. The Nusselt number was investigated in the heat exchanger (HE) over a wide range of operating conditions, Reynolds number (Re =205-3200), and oscillatory flow Reynolds number (Reo =0-3800). The results showed a significant enhancement in the tube-side Nusselt number, Nu. 5-fold heat transfer enhancement was achieved at maximum oscillatory and flow rates, the maximum Nu=180 at Re =1500 and Reo=3800. The flow rate had more impact on the heat transfer enhancement than the oscillatory flow by 1.25 whe

APA, Harvard, Vancouver, ISO, and other styles

42

Ichimiya, Koichi, and Yoshio Yamada. "Three-Dimensional Heat Transfer of a Confined Circular Impinging Jet With Buoyancy Effects." Journal of Heat Transfer 125, no. 2 (2003): 250–56. http://dx.doi.org/10.1115/1.1527901.

Full text

Abstract:

This paper describes the heat transfer and flow characteristics of a single circular laminar impinging jet including buoyancy force in a comparatively narrow space with a confined wall. Temperature distribution and velocity vectors in the space were obtained numerically by solving three-dimensional governing equations for the Reynolds number Re=umD/ν=400-2000 and the dimensionless space, H=h/D=0.25-1.0. After impingement, heat transfer behavior on the impingement surface is divided into a forced convection region, a mixed convection region, and a natural convection region in the radial directi

APA, Harvard, Vancouver, ISO, and other styles

43

Amor, Noureddine, Antar Tahiri, Hadi Taibi, and Lakhdar Aidaoui. "Assessing the heat transfer enhancement of turbulent nanofluid flow in a uniformly heated channel. CFD investigation." STUDIES IN ENGINEERING AND EXACT SCIENCES 5, no. 2 (2024): e8912. http://dx.doi.org/10.54021/seesv5n2-310.

Full text

Abstract:

In this work, a numerical investigation is carried out aiming to simulate forced convective heat transfer of nanofluid flow in the turbulent regime. The Water-AL2O3 nanofluid flows in a 2D horizontal and circular channel, where its outer wall is maintained to a constant temperature. The effect of different parameters such as Reynolds number Re ranging from 2 104 to 105 and the nanoparticles solid volume fraction phi going from 1% to 5% on the heat transfer variation presented in terms of Nusselt number Nu is examined in this study. Validation of the used computational fluid dynamics model conf

APA, Harvard, Vancouver, ISO, and other styles

44

Niazmand, Sola, Alinejad, and Rahimidehgolan. "Investigation of Mixed Convection in a Cylindrical Lid Driven Cavity Filled with Water-Cu Nanofluid." Inventions 4, no. 4 (2019): 60. http://dx.doi.org/10.3390/inventions4040060.

Full text

Abstract:

The present numerical research studies the effect of nano-materials in a lid-driven cylindrical cavity with rotation of circumferential top wall. The heat is transferred from two lateral walls to the domain by constant temperature conditions while other walls are kept isolated. The non-dimensional equations are solved by Finite Volume Method (FVM) and SIMPLEC method. The effect of Reynolds (Re = 100, 400, 1000), Ryleigh (Ra = 104, 105, 106) numbers are studied. In addition, the effect of concentration of nano materials (ϕ = 0%, 1%, 5%), the Height Ratio (HR = 1, 0.5, 2) on Nusselt number, isot

APA, Harvard, Vancouver, ISO, and other styles

45

Bolló, B. "Low Reynolds number flow around and heat transfer from a heated circular cylinder." International Review of Applied Sciences and Engineering 1, no. 1-2 (2010): 15–20. http://dx.doi.org/10.1556/irase.1.2010.1-2.3.

Full text

Abstract:

Abstract The two-dimensional flow around a stationary heated circular cylinder at low Reynolds numbers of 50 < Re < 210 is investigated numerically using the FLUENT commercial software package. The dimensionless vortex shedding frequency (St) reduces with increasing temperature at a given Reynolds number. The effective temperature concept was used and St-Re data were successfully transformed to the St-Reeff curve. Comparisons include root-mean-square values of the lift coefficient and Nusselt number. The results agree well with available data in the literature.

APA, Harvard, Vancouver, ISO, and other styles

46

Manjula, Tejeshwara, Nakul Sreedhar, and Nidhul Kottayat. "Novel Microchannel Based Indirect Liquid Cooling for Lithium-Ion Battery Thermal Management: A 3-D CFD Study." CFD Letters 17, no. 11 (2025): 204–19. https://doi.org/10.37934/cfdl.17.11.204219.

Full text

Abstract:

Effective battery pack thermal management is critical in electric vehicle performance optimization. This study evaluates the efficacy of water cooling, utilizing microchannels embedded within an aluminium block, in mitigating thermal run-away within battery packs due to excessive heat generation while charging and discharging. A comparison between rectangular and square cross-section microchannels for varying Reynolds numbers is conducted to determine the optimal geometry for enhanced efficiency. Results indicate that integrating water cooling through aluminium microchannels significantly redu

APA, Harvard, Vancouver, ISO, and other styles

47

Hossain, Amzad, Md Mamun Molla, Md Kamrujjaman, Muhammad Mohebujjaman, and Suvash C. Saha. "MHD Mixed Convection of Non-Newtonian Bingham Nanofluid in a Wavy Enclosure with Temperature-Dependent Thermophysical Properties: A Sensitivity Analysis by Response Surface Methodology." Energies 16, no. 11 (2023): 4408. http://dx.doi.org/10.3390/en16114408.

Full text

Abstract:

The numerical investigation of magneto-hydrodynamic (MHD) mixed convection flow and entropy formation of non-Newtonian Bingham fluid in a lid-driven wavy square cavity filled with nanofluid was investigated by the finite volume method (FVM). The numerical data-based temperature and nanoparticle size-dependent correlations for the Al2O3-water nanofluids are used here. The physical model is a two-dimensional wavy square cavity with thermally adiabatic horizontal boundaries, while the right and left vertical walls maintain a temperature of TC and TH, respectively. The top wall has a steady speed

APA, Harvard, Vancouver, ISO, and other styles

48

Nourollahi, Mostafa, Mousa Farhadi, and Kurosh Sedighi. "Numerical study of mixed convection and entropy generation in the Poiseulle-Benard channel in different angles." Thermal Science 14, no. 2 (2010): 329–40. http://dx.doi.org/10.2298/tsci1002329n.

Full text

Abstract:

The issue of entropy generation and Nusselt number in Poiseuille-Benard channel flow are analyzed by solving numerically Navier-Stokes and energy equations with the use of the classic Boussinesq incompressible approximation. The Nusselt number is studied as a function of q. In addition variations of entropy generation and the Bejan number as a function of q and j are studied. The channel angle (q) and irreversibility (j) were changed from -25 to 30 and from 10-5 to 1, respectively, whereas Reynolds, Peclet, and Rayleigh numbers were fixed at Re = 10, Pe = 20/3, and Ra = 104. More over the posi

APA, Harvard, Vancouver, ISO, and other styles

49

Armaghani, Taher, Muneer Ismael, Ali Chamkha, and Ioan Pop. "Mixed Convection and Entropy Generation of an Ag-Water Nanofluid in an Inclined L-Shaped Channel." Energies 12, no. 6 (2019): 1150. http://dx.doi.org/10.3390/en12061150.

Full text

Abstract:

This paper investigates the mixed convection and entropy generation of an Ag-water nanofluid in an L-shaped channel fixed at an inclination angle of 30° to the horizontal axis. An isothermal heat source was positioned in the middle of the right inclined wall of the channel while the other walls were kept adiabatic. The finite volume method was used for solving the problem’s governing equations. The numerical results were obtained for a range of pertinent parameters: Reynolds number, Richardson number, aspect ratio, and the nanoparticles volume fraction. These results were Re = 50–200; Ri = 0.1

APA, Harvard, Vancouver, ISO, and other styles

50

Kanna, Parthasarathy Rajesh, Yaswanth Sivakumar, G. V. Durga Prasad, Dawid Taler, Tomasz Sobota, and Jan Taler. "Numerical Investigation of Flow and Heat Transfer from Twin Circular Cylinders Present in Double Forward-Facing Step." Fluids 10, no. 2 (2025): 48. https://doi.org/10.3390/fluids10020048.

Full text

Abstract:

A numerical simulation of the circular cylinder as an obstacle in a double forward-facing (DFFS) step was performed. The size and position of the upstream cylinder (c1) and downstream cylinder (c2) were varied to explore their role in heat transfer in both laminar and turbulent conditions. Comparative results of the upper and lower half of the downstream cylinder were plotted as results to understand the heat transfer and flow characteristics around the downstream cylinder due to the effect of the upstream cylinder’s dimension and position. For Re = 800, when the c1 is placed near the bottom o

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!