عنوان مقاله [English]
نویسندگان [English]چکیده [English]
In this work a rectangular micro heat exchanger with constant hydraulic diameter at various aspect ratios was considered. The pressure drop and thermal parameters of the micro heat exchanger in laminar flow at different Reynolds numbers (25, 50, 100, 150, 225 and 300) at constant heat flux of 0.3 MWatt/m2 were analyzed and compared. Also, the effect of temperature-dependent fluid properties (viscosity, conductivity coefficient) on the pressure drop and the average and maximum temperature rise of fluid and thermal resistance of micro heat exchanger were investigated. Finally, a new criterion based on pumping power and transmitted heat per temperature gradient unit was proposed as a tool to evaluate micro heat exchangers' performance.