Influence of geometric parameters on flow and temperature characteristics in partitioned thermal convection

Strong coupling between height of gaps and thickness of thermal boundary layer in partitioned convection system*

“…For multi-partition systems, when the number of partitions is large, the influence of the aspect ratio of the convective cell on the flow and heat transfer efficiency is negligible. [16] In order to reduce the CPU time, the aspect ratio Γ is selected as 2 in this paper. For systems with higher Ra number, the more meshes are generally required, so the grid size of the sample with Ra = 2 × 10 9 is tested.…”

“…Compared with the standard RB convection system, it was found by experiments and numerical simulations that some non-standard RB thermal convection systems can enhance heat transfer efficiency, such as RB convection with rough plates, [5][6][7] corilois force, [8][9][10] with phase transition, [11] with polymer addition, [12,13] partitions. [14][15][16][17][18] There are both passive and active ways to improve the heat transfer efficiency. Due to the fact that the passive method does not introduce external powers, it has been widely concerned and deeply studied for a long time.…”

“…Through numerical simulation, Bao et al [15] found that when the number of partitions increased to 28, adjusting the height of gaps can further improve the heat transfer efficiency, which was excited up to 3.1 times that of the non-partition device. Lin et al [16] further studied the influence of different geometrical parameters on the flow and heat transfer characteristics of the system, and found that the height of gaps is the key geometric parameter in the partitioned convection system. Lin and Bao [17] focused on the TD number, representing the strength of heat separation in this system, and found that TD reflects the magnitude of buoyancy, which is balanced by the pressure difference ∆P between the top and bottom of the heat transfer channels.…”

Influence of pressure on flow and heat transfer in partitioned thermal convection

“…基于Oberbeck-Boussinesq近似, 无量纲化的二维 [18] , 然而传热却发生在传热通 道中, 因此本研究先从传热通道中压力分布特性开始. The pressure characteristics and effects on the flow in the partitioned thermal convection were studied with the direct numerical simulation (DNS).…”

Influence of <italic>Ra</italic> number on flow and heat transfer in partitioned Rayleigh-Bénard convection

“…包芸等人 [20] 对隔板对流系统做了进一步的数值研 究, 发现狭缝高度的改变可使传热效率进一步提高, 可达无隔板装置的3.1倍, 并讨论了传热通道中的温度 漂移特性. 林泽鹏和包芸 [21] 传热通道的流动速度和温度漂移量值基本一样 [20] . 通过隔板对流系统的平均场, 可以计算隔板对流 系统的传热Nu数.…”