Flow and heat transfer behaviour of Al2O3-CUO/water hybrid nano fluid in rectangular microchannels

2021 ◽  
pp. 1-21
Author(s):  
P. Sreeraj ◽  
S. Thirumalai Kumaran ◽  
M. Uthayakumar ◽  
S. Suresh Kumar ◽  
M. Sivasubramanian ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Rectangular Microchannels ◽  
Nano Fluid ◽  
Flow And Heat Transfer

Variable Property Effects in Simultaneously Developing Gaseous Slip-Flow in Rectangular Microchannels With Prescribed Wall Heat Flux

2010 ◽  
Author(s):  
Azad Qazi Zade ◽  
Metin Renksizbulut ◽  
Jacob Friedman
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Knudsen Number ◽  
Thermophysical Properties ◽  
Slip Flow ◽  
Wall Heat Flux ◽  
Heat Transfer Characteristics ◽  
Rectangular Microchannels ◽  
Transfer Characteristics ◽  
Flow And Heat Transfer

The effects of variable physical properties on the flow and heat transfer characteristics of simultaneously developing slip-flow in rectangular microchannels with constant wall heat flux are numerically investigated. A co-located finite-volume method is used in order to solve the mass, momentum and energy equations in their most general form. Thermophysical properties of the flowing gas are functions of temperature, while density and Knudsen number are allowed to change with both pressure and temperature. Different Knudsen numbers are considered in order to study the effects of slip-flow. Simulations indicate that the constant physical property assumption can result in under/over-prediction of the local friction and heat transfer coefficients depending on the problem configuration. Density and thermophysical property variations have significant effects on predicting flow and heat transfer characteristics since the gas temperature constantly changes as a result of the applied wall heat flux. Heat transfer coefficient is affected both due to the change in the velocity field and change in thermophysical properties. Also temperature dependence of the local Knudsen number can significantly alter the friction coefficients due to its strong dependence on slip conditions. The degree of discrepancy varies for different cases depending on the Knudsen number, and the applied heat flux strength and direction (cooling versus heating).

scholarly journals MODELING OF ROUGHNESS EFFECT ON LAMINAR FLOW AND HEAT TRANSFER IN RECTANGULAR MICROCHANNELS

Equipment ◽  
2006 ◽  
Author(s):  
G. Gamrat ◽  
M. Favre-Marinet ◽  
S. Le Person ◽  
R. Baviere ◽  
F. Ayela
Keyword(s):  
Heat Transfer ◽  
Laminar Flow ◽  
Roughness Effect ◽  
Rectangular Microchannels ◽  
Flow And Heat Transfer

Viscous Dissipation Effect on Heat Transfer Through Nano Fluid in a Vertical Wavy Channel with Travelling Thermal Wave

2020 ◽  
Vol 28 ◽  
pp. 17-31
Author(s):  
Paladugu Venkata Ramana ◽  
Gosukonda Srinivas ◽  
G.V.P.N Srikanth
Keyword(s):  
Heat Transfer ◽  
Porous Media ◽  
Fluid Flow ◽  
Differential Equations ◽  
Viscous Dissipation ◽  
Thermal Wave ◽  
Transfer Rate ◽  
Wavy Channel ◽  
Nano Fluid ◽  
Flow And Heat Transfer

The effect of viscous dissipation on heat transfer through nano-fluid in a vertical wavy channel filled with porous media has been studied. The consequential differential equations are simplified by the R-K method of 6th order. The numerical obtained results are shown in the graphs. The significant results of fluid flow and heat transfer rate and its properties are shown graphically. Nusslet values are calculated a for varying the governing parameters φ Da, Gr, ε, Ec and the remaining parameters are to be constants.

Numerical Simulation of Geometrical Effects on the Liquid Flow and Heat Transfer in Smooth Rectangular Microchannels

2009 ◽  
Author(s):  
Heming Yun ◽  
Baoming Chen ◽  
Binjian Chen
Keyword(s):  
Heat Transfer ◽  
Channel Length ◽  
Hydraulic Diameter ◽  
Heat Transfer Characteristics ◽  
Rectangular Microchannels ◽  
Microchannel Heat Exchanger ◽  
Flow And Heat Transfer ◽  
Optimizing Design ◽  
Geometrical Effects ◽  
Cfd Method

The flow and heat transfer characteristics of water in smooth rectangular microchannels had been simulated numerically by using CFD method. Computational results showed that the ratio of the channel length and hydraulic diameter, hydraulic diameter, the ratio of height and width of microchannels, porous ratio had different effects on the flow and heat transfer of microchannels. On the condition of the ratio of the length and hydraulic diameter of channel greater than 70, thereby the entrance effects could be neglected, the effect of hydraulic diameter, the ratio of height and width of microchannels and porous ratio on flow and heat transfer in microchannels had been simulated respectively. The mechanism of flow and heat transfer of each condition had been obtained, which could offer important data to discuss the mechanism of flow and heat transfer in microchannels further and realize the goal of optimizing design of microchannel heat exchanger.

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