摘要
用烟雾示踪和全息测温方法,在密闭空间条件下,对三种不同长径比的水平线热源自然对流中的热绕流现象进行流场可视化及实验研究。热线的长径比为300,800,1400。通过测量不同加热强度热线的热绕流区和全场温度,得到了热绕流带与温度尺度格拉晓夫数G_r的关系。这对热控制技术及热绕流概念用于工程设计中,具有一定的指导意义。
In a sealed vessel and by smoke tracing and holometry, visualizes RATF phonomenon of horizontal heated line source with defferent lenth/diameter ratios (300, 800 and 1400). Relationship between RATF and Grashof number Gr has been obtained by measuring RATF region at various heating rates and the whole temperature. The relation is : when Gr is greater than 2×10~8, the non-dimensional length and width of RATF strip respectively decreases and widens as Grashof number increses. The investigation is useful for application of thermal control technique and RATF concept to engineering design.
关键词
热绕动
自然对流
换热
热控制
Heat flow
Heat transfer free convection
temperature field
Thermal control
/Round about thermal flow
