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In order to examine the impact of wall temperature change on the flow and heat transfer properties of rarefied gases in restricted space, the discrete unified gas kinetic scheme (DUGKS) is applied to the simulation of the thermal creep flows in a square cavity. All the boundaries of the cavity are stationary and diffuse reflection walls. The left and right walls have a lower temperature, and the upper and lower ones are under harmonic heating. The simulation parameters considered in the present work are set as follows: the Knudsen number 0.01 ≤ Kn ≤ 10, temperature change frequency 0.5 ≤ St ≤ 5, and Temperature change amplitude 0.1 ≤ Ah ≤ 0.8. The results indicate that the velocity and temperature fields in the cavity exhibit periodic variations. No inverse Fourier heat transfer phenomenon was observed within the parameter ranges studied. The intensity of the thermal creep flow can be increased by increasing the frequency and amplitude of the temperature, and the Knudsen number. This can also raise the temperature jump and velocity slip close to the temperature change walls. Heat transfer lag and a reduction in the wall's heat transfer capability are caused by increases in St and Kn. When St = 0.5 is small, a complex vortex structure is seen in the cavity. As the value of St rises to 5, the vortex disappears, the gas travels from the variable temperature wall to the cavity's horizontal centerline, and the region close to the middle of the left and right walls changes from an endothermic to an exothermic zone. Furthermore, the temperature and velocity fields inside the cavity hardly change, but the degree of heat transfer on the wall decreases with larger Ah. This work offers helpful recommendations for the design of MEMS devices that use pulsing heating.
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Keywords:
- Thermal creep flows /
- DUGKS /
- thermally induced oscillating flow /
- Diffuse Boundary
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