Study the Effect of Axial Heat Conduction in Microchannel Heat Exchanger with Different Channels Geometries

Abstract

In this paper numerical investigation has been made to study the effect of axial heat conduction in microchannel heat exchanger with different geometries of channels (square, circle, iso- triangle, trapezoidal). The flow is studied with varying Reynolds number (100–900) as laminar, incompressible, 3D, single phase, steady state are solved numerically. The behiaver of axial heat conduction under different thickness of wall is investigated in this article. The results showed that, existing axial heat conduction reduction the effectiveness of heat exchanger and rate of heat transfer also with increasing Reynold number axial heat conduction increased. The paper study the effect of channel shape and explained the triangle channel has maximum axial heat conduction followed by trapezoidal channel. The factors which affect on axial heat conduction are Reynold number, thickness of separating wall, direction of flow and channel shape Worked in this paper comparison between the results of parallel flow and counter flow of microchannel heat exchanger with considering axial heat conduction. Three types of working fluids (air, water, ethylene-glycol) used in this work, also to simplifying efforts and reduce time for researchers in this field predict correlations describe the effect of axial heat conduction.