Spray cooling characteristics of water and R-134a. Part 1: nucleate boiling Hsieh, Shou Shing; Fan, Tsung Cheng; Tsai, Huang Hsui [National Sun Yat Sen Univ., Kaohsiung, Taiwan (China). Dept. of Mechanical and Electro-Mechanical Engineering] 42 ENGINEERING; SPRAY COOLING; WORKING FLUIDS; WATER; SURFACES; NUCLEATE BOILING An experimental study was made in the first of two papers to determine the effect of liquid sprays used to cool a hot surface. Both pure water and R-134a were served as a working medium sprayed from a single circular nozzle onto a Cu (oxygen free) metal of an electrically heated surface which was heated to an initial temperature with a range of wall superheat for steady-state nucleate boiling experiments using thermocouples for heat transfer measurements. Cooling characteristics (boiling curves) were obtained over a range of spray mass flux, Weber number, wall superheat and degree of subcooling. Boiling visualization was also conducted with varied heat flux levels at a specified We for R-134a and water. (author) United Kingdom 2004-12-01 English Journal Article Journal Name: International Journal of Heat and Mass Transfer; Journal Volume: 47; Journal Issue: 26; Other Information: PBD: Dec 2004 Medium: X; Size: page(s) 5703-5712 https://doi.org/10.1016/j.ijheatmasstransfer.2004.07.022 [] 26 47 Journal ID: ISSN 0017-9310; IJHMAK; TRN: GB0421000 GB 2010-12-31 20540190