Heat transfer from moving surfaces in a micropolar fluid

1999 ◽  
Vol 77 (6) ◽  
pp. 463-471 ◽  
Author(s):  
M A Mansour ◽  
A A Mohammadein ◽  
S MM El-Kabeir ◽  
RSR Gorla
Keyword(s):  
Heat Transfer ◽  
Micropolar Fluid ◽  
Free Stream ◽  
Plane Surface ◽  
Heat Transfer Characteristics ◽  
Flow And Heat Transfer ◽  
Layer Analysis ◽  
Convection Problem ◽  
Energy Equations ◽  
Flowing Stream

A boundary layer analysis is presented for the forced convection problem of a surface moving continuously in a flowing stream of a micropolar fluid. Two cases are considered, one corresponding to a plane surface moving in parallel with the free stream and the other, a surface moving in the opposite direction to the free stream. A similarity solution to the governing momentum, angular momentum, and energy equations is derived.These equations were solved numerically and the flow and heat transfer characteristics of the micropolar fluid are presented. PACS No.: 61.00

Effects of Dented Roughness on Laminar Flow and Heat Transfer in Microchannels

2010 ◽  
Author(s):  
Hui Miao ◽  
Yong Huang ◽  
Fa Xie ◽  
Haigang Chen ◽  
Fang Wang
Keyword(s):  
Heat Transfer ◽  
Laminar Flow ◽  
Working Fluid ◽  
Heat Transfer Characteristics ◽  
Nusselt Numbers ◽  
Flow And Heat Transfer ◽  
Micro Channels ◽  
Planar Area ◽  
Poiseuille Number ◽  
Energy Equations

Liquid laminar flow and heat transfer characteristics for parallel plate micro-channels consisting of many triangle shape hollows to fit with the etching surfaces are investigated numerically in the present paper. The height of the channel is 50μm, with three different relative depths, three relative spacing, and three oblique angles of the triangle surface, respectively. The 2D N-S and energy equations are solved using a commercial CFD code FLUENT6.3. Water is used as the working fluid, and the Reynolds number ranges from 100 to 1500. The global Poiseuille number and average Nusselt number are obtained. It is shown that the dented shapes cause a modest influence in Poiseuille number, but a greater impact on the Nusselt numbers. In addition, both of Po and Nu increase modestly with Re. The local Nusselt numbers are always lower in dented area and larger in planar area of dented roughness microchannels, than that of conventional smooth value. Finally, geometry parameters have modest impact on heat transfer for dented roughness.

scholarly journals Analysis of the flow and heat transfer characteristics for MHD free convection in an enclosure with a heated obstacle

2011 ◽  
Vol 16 (1) ◽  
pp. 89-99 ◽  
Author(s):  
S. Parvin ◽  
R. Nasrin
Keyword(s):  
Heat Transfer ◽  
Hartmann Number ◽  
Heated Wall ◽  
Convection Flow ◽  
Heat Transfer Characteristics ◽  
Natural Convection Flow ◽  
Square Enclosure ◽  
Thermal Fields ◽  
Flow And Heat Transfer ◽  
Energy Equations

Finite element method based on Galerkin weighted Residual approach is used to solve two-dimensional governing mass, momentum and energy equations for steady state, natural convection flow in presence of magnetic field inside a square enclosure. The cavity consists of three adiabatic walls and one constantly heated wall. A uniformly heated circular solid body is located at the centre of the enclosure. The aim of this study is to describe the effects of MHD on the flow and thermal fields in presence of such heated obstacle. The investigations are conducted for different values of Rayleigh number (Ra) and Hartmann number (Ha). Various characteristics of streamlines, isotherms and heat transfer rate in terms of the average Nusselt number (Nu) are presented for different parameters. The effect of physical parameter (D) is also shown here. The results indicate that the flow pattern and temperature field are significantly dependent on the above mentioned parameters.

The Development of Free Convection Between Heated Vertical Plates

1962 ◽  
Vol 84 (1) ◽  
pp. 40-43 ◽  
Author(s):  
J. R. Bodoia ◽  
J. F. Osterle
Keyword(s):  
Heat Transfer ◽  
Finite Difference ◽  
Velocity Profile ◽  
Free Convection ◽  
Viscous Fluid ◽  
Heat Transfer Characteristics ◽  
Flow And Heat Transfer ◽  
Difference Form ◽  
Temperature And Pressure ◽  
Energy Equations

The development of free convection in a viscous fluid between heated vertical plates is investigated. The basic governing continuity, momentum, and energy equations are expressed in finite difference form and solved numerically on a digital computer. Results are obtained for the variations of velocity, temperature, and pressure throughout the flow field assuming the fluid to enter the channel with ambient temperature and a flat velocity profile. The flow and heat-transfer characteristics of the channel are studied and a development height established. A comparison is made between the results of this theoretical investigation and the experimental work of Elenbaas.

scholarly journals On combined effect of thermal radiation and viscous dissipation in hydromagnetic micropolar fluid flow between two stretchable disks

2017 ◽  
Vol 21 (5) ◽  
pp. 2155-2166 ◽  
Author(s):  
Kashif Ali ◽  
Shahzad Ahmad ◽  
Muhammad Ashraf
Keyword(s):  
Heat Transfer ◽  
Viscous Dissipation ◽  
Micropolar Fluid ◽  
Thermal Control ◽  
Linearization Method ◽  
Heat Transfer Characteristics ◽  
Electrically Conducting ◽  
Flow And Heat Transfer ◽  
Micropolar Fluid Flow ◽  
Self Similar

In this paper, we investigate numerically the flow and heat transfer characteristics of a viscous incompressible electrically conducting micropolar fluid between two infinite uniformly stretching disks, taking the radiation and viscous dissipation effects into consideration. The transformed self similar coupled ordinary differential equations are solved using quasi-linearization method. The study may be beneficial in flow and thermal control of polymeric processing.

An analysis of flow and heat transfer in separated flows over blocked surface

2012 ◽  
Vol 227 (3) ◽  
pp. 481-491
Author(s):  
O Yemenici ◽  
ZA Firatoglu
Keyword(s):  
Heat Transfer ◽  
Turbulent Flows ◽  
Free Stream ◽  
Separated Flows ◽  
Stream Velocity ◽  
Transfer Enhancement ◽  
Heat Transfer Characteristics ◽  
Free Stream Turbulence ◽  
Intensity Measurements ◽  
Flow And Heat Transfer

The flow and heat transfer characteristics of flat and blocked surfaces were experimentally examined under the influence of the free stream velocity of 3, 5, 10 and 15 m/s encompassing laminar, transitional and turbulent flows. A constant-temperature hot wire anemometer was used for the velocity and turbulent intensity measurements, and copper-constant thermocouples and a micro-manometer for temperature and static pressures measurements, respectively. The flow over blocked surface separated in front of the first block and attached on it, then circulated between blocks, and then reattached behind the last block. The results showed that the flow separation before the first block occurred earlier in laminar–laminar separated–reattached flow than the transitional and turbulent flows and turbulent–turbulent separated–reattached flow leading to a shorter reattachment region with high free-stream turbulence. The presence of the separation and reattachment caused the heat transfer enhancement, which was more pronounced in the laminar flow and new empirical equations were developed for the local Stanton numbers.

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