Enhancement of Two-Fhase Heat Transfer by Graphene Coated Surface

• Main Authors: Jhu,Yong-Jhe, 朱永喆
• Other Authors: Hsu, Chin-Chi
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/bwdsyq

碩士 === 國立聯合大學 === 機械工程學系碩士班 === 105 === The purpose of this study is to investigate the behavior of the high thermal conductivity of graphene in gas to liquid two-phase flow, expecting the heat flux to be enhanced. Three methods are introduced in this study. The first method is using the chemical vapor deposition. Following the data from the references, the graphene material was deposited on the copper sheet with trial and error method. Multilayer graphene are prepared. The second method is using liquid phase stripping process to obtain graphene powder, which is sold in the market, this is done by surface treatment on the copper testing piece with sol-gel method. The third method is using plain copper testing piece as the control experiment. Heat was generated from the power supplier, and temperature is controllable by adjusting the input power. Calculating by using the thermocouple to the temperature and the amount of change of the time, the heat flux and the time required for the evaporation process are calculated. Using a high-speed camera to observe the evaporation of the droplets and a contact angle meter to analyze the volume and water contact angle change on the copper surfaces. The effects of two-phase heat transfer of the copper sheet with graphene material are investigated in this study.