Effect of electrohydrodynamic (EHD) on condensation of R-134a in presence of non-condensable gas

✍ Scribed by Hamid Omidvarborna; Arjomand Mehrabani-Zeinabad; Mohsen Nasr Esfahany

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 561 KB
• Volume: 36
• Category: Article
• ISSN: 0735-1933
• DOI: 10.1016/j.icheatmasstransfer.2008.10.014

✦ Synopsis

Effects of applying EHD and non-condensable (NC) gas contents have been experimentally studied on intertubular condensation of refrigerant R-134a flow. Applying of electrical field enhances condensing heat transfer coefficient (CHTC), but presence of NC gas in condensing vapour reduces this coefficient. In competition of these two effective parameters on condensation, it can be observed that at higher concentration of NC gas, the effect of electrical field on enhancement of CHTC is greatly reduced. But at lower concentration of NC gas, the effect of electrical field is more considerable, due to thickness of heat transfer boundary layer.