二維光纖式都普勒雷射測速儀 – 微熱傳增強研究室

二維光纖式都普勒雷射測速儀

二維光纖式都普勒雷射測速儀

都普勒雷射測速儀的光源使用6W的氬離子雷射激發器(最新的測試值為全功率7.7W輸出),在激光器產生光源後,將其導入一系列的光學鏡片分光取出Green(5145A)及 Blue(4880A)兩道光束,分別作 X軸及Y軸的光束量測。在過去,LDV 系統應用於二通路內流場之速度量測,並配合測試區域的旋轉,開發出旋轉即時(Real Time)同步的量測技巧(請見摘要)。近年,用以量測池沸騰熱傳之氣泡速度 (Bubble Velosity)及氣泡頻率Bubble Frequency。

Local heat transfer and velocity measurements in a rotating ribbed two-pass square channel with uneven wall temperatures

Author
Source
Abstract
S. S. Hsieh, Y. S. Wang and M. H. Chiang
Journal of Heat Transfer, Transactions ASME v.119 n.4 Nov 1997 ASME pp. 843-848
0022-1481
Experimental data from both heat transfer experiments and LDV measurements in a rotating two pass oppositely rib-roughened square channel with uneven wall temperatures are extensively studied. Coriolis-induced secondary flows are shown to enhance local heat transfer over the trailing/leading surface in the first/second pass compared to a duct without rotation. Centrifugal bouyancy is shown to influence the heat transfer response with heat transfer being imposed on both leading and trailing surfaces as the wall-to-bulk fluid temperature difference is increased with other controlling parameters fixed. Further, LDV measurements verify the present and previous heat transfer measurements with and without rotation.