Analysis of Rectangular Microchannel under Forced convection heat transfer condition

摘要

Micro-convection is a strategic area in transport phenomena, since it is the basis for a wide range of miniaturized high-performance applications. Surface area is one of the important concepts for high flux heat transfer in Microchannel performance. Microchannel with hydraulic diameters 440m, 476m, 500m and 550m are analyzed for optimize microchannel hydraulic diameter. The microchannel having height of 400m, 450m, 500m, 600m with width of 500m is analyzed numerically. Spacing between microchannel is also varied in range of 250m, 300m, 350mand 400m are considered for the analysis. Cu material microchannel having length of 30mm which carries 20 microchannels on top surface of the cu piece is to be considered. Flow rate also varied from 5lpm to 30 lpm for optimization with water as a medium. From numerical study it is observed that as hydraulic diameter increases from 444m to 545 m the flow rate pressure drop also increases with decreases in diameter. Also heat in put to microchannel as increases from 5 watt to 80 watt temperature drop is high at flow rate of 17lpm to 20 lpm. From analysis it is observed that as hydraulic diameter of microchannel is major concept of microchannel heat transfer which is dependent on flow rate of water in microchannel. The microchannels with hydraulic diameter of 440m to 600m will follow temperature drop up-to 6K with heat input of 5 watt to 80watt with flow rate of 5lpm to 25lpm.