Influence of pressure on flow and heat transfer in partitioned thermal convection
Abstract
<p indent="0mm">The pressure characteristics and effects on the flow in the partitioned thermal convection were studied with the direct numerical simulation (DNS). With the flow instability, the longitudinal pressure difference between the upper and below plates in the heat transfer channel is synchronized with the temperature drift and the velocity, and finally the pressure alternate distribution between the partitions is formed. The pressure has the linear distribution in the horizontal gaps and the vertical channels in the partitioned convection system, and both pressure gradients are the constant value. The pressure gradient have the same direction with the flow in the horizontal gaps, but the opposite direction in the vertical heat transfer channels. The flow in the gaps is the two-dimensional Poiseuille flow driven by the horizontal pressure gradient, and its velocity profile presents parabolic style. The pressure difference in the vertical heat transfer channels is generated by resisting temperature drift which produce one-way buoyancy. The flow in the vertical channels is affected little by the longitudinal force at the condition of <italic>b</italic>≥4<italic>d</italic>, and is mainly maintained by the continuity of the flow in the horizontal gaps.</p>
