應用微奈米結構增強沸騰熱傳

Abstract

沸騰由於其過程伴隨著液氣等溫相變與相對大的液氣變化潛熱是一個非常有效的熱傳 機制，故沸騰熱傳目前廣泛應用於全世界各種熱循環系統中，沸騰之臨界熱通量(CHF) 與熱傳系數(HTC)決定了此機制的最大熱傳量與沸騰熱傳之有效性，在此計畫中我們將 提出一嶄新之微/奈米線陣列多尺度結構，此結構可以同時保有高的毛細限(capillary limit)，並能控制沸騰之流體不穩定限(hydrodynamic limit)，我們將應用此微/奈米 線陣列多尺度結構來驗證我們之前所提之CHF 假說，此假說可以解決幾十年來學界對 沸騰CHF 之辯論，進而我們將應用此微/奈米線陣列多尺度結構來控制CHF 並提升沸騰 之CHF 與HTC。

Boiling along with its isothermal liquid-vapor phase transition and a large latent heat is a very effective heat transfer mechanism. Thus, boiling heat transfer is widely exploited in various thermal cycling systems in the world. The critical heat flux (CHF) and heat transfer coefficient (HTC) of boiling restrict the maximum amount of heat transfer and the effectiveness of boiling heat transfer. In this project, we propose a multi-scale structure consisting of a main- and a sub- micro/nanowire array to innovatively control and enhance CHF and HTC of pool boiling. This multi-scale structure could sustain a large capillary limit while having a controllable hydrodynamic limit. We will first apply this multi-scale structure to verify our previous CHF hypothesis. This hypothesis could potentially solve decades of debate among the researchers about the mechanism causing CHF. In addition, we will apply this multi-scale structure to control and consequently enhance the CHF and HTC of pool boiling.