【摘要】：液封厚度對液封系統(tǒng)內(nèi)的熱毛細(xì)對流有著重要的影響,但已有的大多數(shù)研究集中于單向溫差下流體在液封系統(tǒng)中的流動.文中采用數(shù)值模擬方法研究了液封厚度對雙向溫差下環(huán)形雙液層內(nèi)熱毛細(xì)對流的影響.模擬過程中,液池底部施加線性溫度梯度,自由表面考慮對流換熱,厚度比H_r取0.1~0.9,熱毛細(xì)雷諾數(shù)Re取0~1.5×10~6,液池深寬比Γ取0.1、0.2、0.3.結(jié)果表明:Re較小時流動為穩(wěn)態(tài),熱毛細(xì)對流強(qiáng)度隨H_r增大而減弱;當(dāng)Re不斷增大至超過一定值時,流體的流動轉(zhuǎn)變?yōu)檎袷幍亩喟鲃?流體振蕩振幅和流動強(qiáng)度隨H_r增大而減小;流動轉(zhuǎn)變的臨界值不隨H_r單調(diào)變化,H_r=0.5~0.7可以使得不同Γ下的臨界Re最大,此時流動穩(wěn)定性最好.
[Abstract]:The thickness of liquid seal has an important influence on the thermal capillary convection in liquid seal system, but most of the existing studies focus on the flow of fluid in liquid seal system under unidirectional temperature difference. In this paper, the effect of liquid seal thickness on thermal capillary convection in annular double liquid layer under bidirectional temperature difference is studied by numerical simulation method. In the simulation process, the linear temperature gradient is applied at the bottom of the liquid pool, the convective heat transfer is considered on the free surface, the thickness ratio H 鈮，

本文編號：2497480