Fluid Flow Mixing for Heat Transfer Enhancement in Communicating Converging and Diverging Channels

Yılmaz, Tuncay; Erdinç, Mehmet Tahir

doi:10.1615/ichmt.2014.intsympconvheatmasstransf.630

Cited by 3 publications

(4 citation statements)

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“…The fluid properties are assumed to be constant. For two-dimensional incompressible flow continuity and momentum equations for x and y direction can be written as follows [25]:…”

Section: Model Descriptionmentioning

confidence: 99%

“…Heat transfer in communicating converging and diverging channels are first investigated theoretically and experimentally by Yılmaz and Ayhan [21]. They have showed that due to mixture of the flow perpendicular to flow direction, heat transfer increases %160 compared to parallel plate channels.…”

Section: Introductionmentioning

confidence: 99%

“…The communicating converging-diverging channels can be used in automobile radiators, PV collectors, gas-gas heat exchangers, liquid-liquid plate heat exchangers, etc. Numerical investigation of communicating converging diverging channel is introduced by Yılmaz and Erdinç [25]. To the best of authors' knowledge there is not any other numerical investigation in the open literature concerning the communicating converging-diverging channels.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation of Flow and Heat Transfer in Communicating Converging and Diverging Channels

Erdinç¹

2018

Journal of Thermal Engineering

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Fluid flow and heat transfer in communicating converging and diverging channel has been numerically investigated. Channels are assumed to be at constant wall temperature and the flow is assumed to be steady state and incompressible. Since the flow and temperature fields to repeat periodically after a certain developing length, periodic boundary conditions are used for the calculations. Finite volume method is used to solve the governing differential equations numerically. Computations are performed for different values of the plate angles and Reynolds numbers. Moreover, velocity distributions along the flow field are illustrated. It was found that the converging-diverging channels destroy the boundary layer significantly and Nusselt number is found to be about 400% higher than those of parallel plate channels, whereas due to vortex formation, pressure drop increases also.

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“…The fluid properties are assumed to be constant. For two-dimensional incompressible flow continuity and momentum equations for x and y direction can be written as follows [25]:…”

Section: Model Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Investigation of Flow and Heat Transfer in Communicating Converging and Diverging Channels

Erdinç¹

2018

Journal of Thermal Engineering

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“…Such applications were explained in Yilmaz and Erdinc. 22,23 It is cited earlier that a number of studies were made on classical Jeffery-Hamel flow of Newtonian and Non-Newtonian fluids. In some cases, analytical solutions were obtained for the velocity profile while others computed numerical solutions.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of boundary stresses on Jeffery-Hamel flow subject to Soret/Dufour effects

Asghar

Saif

Ghaffari

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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We have mathematically modeled the problem of convective Jeffery-Hamel flow in the presence of thermo-diffusion and diffusion-thermo effects. The flow is considered to be the steady, incompressible and unidirectional by assuming the velocity only in radial direction. We have also modeled the boundary conditions representing the boundary stresses and assumed that these stresses apply only radially. Then we analyzed the effects of these stresses on the problem. The boundary stresses are defined through traction boundary conditions which are of Robin type. The flow is assumed in the domain [[Formula: see text]] and the constant flow rate condition is applied instead of taking symmetry of the channel. The governing equations are nonlinear coupled partial differential equations. They become a system of nonlinear coupled ordinary differential equations by adopting suitable transformations. Therefore, they are handled numerically. For this purpose, we have developed a scheme using shooting method to solve nonlinear coupled differential equations representing the flow problem and shown the solution procedure via a flow chart. In order to obtain the numerical results, we have taken different values of parameters. Since we have considered the problem of Newtonian fluid, therefore, we considered the values [Formula: see text] for air, carbon disulfide and water respectively at 25°C. Whereas the values of Schmidt number are considered as [Formula: see text] for hydrogen, water vapor, and ammonia respectively at 25°C. The numerical solution is validated by comparing the results with those published in literature. The numerical results of present work show that there occurs no-slip for wedge angle of [Formula: see text] by fixing the other parameters whereas slip is achieved in some other situations. It is noticed that the flow reversal occurs for convergent as well as divergent flow. All boundary layers are affected greatly due to presence of the boundary stresses and the hydrodynamic boundary layer that disappears in the absence of boundary stresses. The freedom in constraint of channel symmetry leads to the occurrence of symmetric as well as asymmetric flow. An interesting theoretical result of opposite behaviors of temperature and concentration profiles for convergent and divergent flows is observed in case of variation of all of the governing parameters. It is also noticed that the simultaneous increase of Soret number and decrease of Dufour number results in occurrence of opposite behavior of temperature and concentration profiles for divergent flow. However, it results in similar behavior of these profiles. The results show that the boundary layer completely disappears in the absence of boundary stresses.

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Heat transfer and fluid flow inside duct with using fan-shape ribs

Ahmed¹

2021

J Appl Eng Science

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A 2-D computational analysis is carried out to calculate heat transfer and friction factor for laminar flow through a rectangular duct with using fan–shape ribs as a turbulator. The types of rib shapes are imported on the heat transfer rate and fluid flow in heat exchangers. The present study makes use of fan-shaped ribs with two arrangements. The first arrangement was downstream fan–shape ribs (case 1) and upstream fan–shape ribs (case 2) is investigated. A commercial finite volume package ANSYS FLUENT 16.1 is used for solving the meshing process with continuity, momentum, and energy equations respectively to investigate fluid flow and heat transfer across the ribs surface. The Reynolds number (Re) range of (400 – 2250) with different relative roughness pitch (p/H= 0.17, 0.22, 0.27 and 0.32) at constant rib high (e/H). The results show that the heat transfers and friction increase with using ribs also, the results show that heat transfer Directly proportional to pitch ratio and Reynolds number. The Nusselt number enhancement by (12% -29%).

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Fluid Flow Mixing for Heat Transfer Enhancement in Communicating Converging and Diverging Channels

Cited by 3 publications

References 0 publications

Numerical Investigation of Flow and Heat Transfer in Communicating Converging and Diverging Channels

Numerical Investigation of Flow and Heat Transfer in Communicating Converging and Diverging Channels

Numerical study of boundary stresses on Jeffery-Hamel flow subject to Soret/Dufour effects

Heat transfer and fluid flow inside duct with using fan-shape ribs

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