Abstract

The effect of structure shape and geometrical parameters of the channel on heat transfer coefficient and thermal deformation of the microchannel water-cooled mirror has been simulated by analyzing the temperature distribution obtained by using FLUENT to solve the 3D steady laminar flow and heat transfer governing equations, and the deformation obtained by coupling the temperature field to ANSYS software. Three different shapes of microchannel, i.e., rectangle, trapezoid and circle, are studyed in this paper. Average heat transfer coefficient of bulk and local interface, and thermal deformation of mirror of each shape examined with three geometrical dimensions, are simulated. It is found that for same channel, the temperature distribution is not symmetrical, the highest temperature moves to the downstream, the heat transfer coefficient of each interface is also different, the heat transfer coefficient of side wall is biggest, the heat transfer coefficient of other walls decreases along the water flow direction. For the mirror using same shape microchannel and hydraulic diameter. The average heat transfer coefficient and thermal deformation are related to hydraulic diameter and channel shape. Reducing hydraulic diameter may help to induce high heat transfer coefficient. The trapezoid channel mirror has the smallest thermal deformation among the three shapes channel mirrors. At the condition of heat flux of 1.47W/cm², and water inlet velocity of 2.54m/s, the thermal deformation of mirror with the smallest trapezoid microchannel is only about 1.6×10⁻²μm. numerically.

© 2011 Optical Society of America