3875

3658

كارشناسي ارشد

مهندسي شيمي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مهندسي شيمي

1386

شانزده، 85، [II]ص.: مصور، جدول، نمودار

ص. ع. به فارسي و انگليسي

ارجمند مهرباني

محسن نصراصفهاني

8/2/87

غلامرضا اعتماد، علي اكبر عالم رجبي

1396/03/08

كتابنامه

مهندسي شيمي

مهندسي شيمي

ID3658

به فارسي وانگليسي: قابل رويت در نسخه ديجيتال

AbstractElectrohydrodynamic EHD has been used widely as an active method for enhancing heat transfer Itprotects environmental issues and energy sources One of its applications is in condensation of vapor Existence of non condensable gas in condensation system is one of the most important parameters thataffects condensation heat transfer coefficient In this thesis effects of EHD on a laboratory scalecondensation system containing a non condensable gas has studied Effects of various non condensable gas concentration applied electrical field and electrode diameter on condensation haveevaluated In this experimental study a horizontal condenser for condensation of R 134a refrigerant inpresence of air as a non condensable gas has been used Experimental results show that application ofelectrical field enhancing heat transfer coefficient Also presence of the non condensable gas incondensing vapor has reduced the coefficient which this issue is in competition with applied electricalfield It is due to variation of boundary layer thickness in heat transferring area Experimental resultsshow that in absence of non condensable gas the condensation heat transfer is enhanced by 85 withimplementation of a 12mm electrode diameter and application of 8kV voltage But in the same systemand in presence of the non condensable gas with volumetric concentration of about 25 heat transfercoefficient is reduced more than 50 However it must be notified that application of EHD alwaysenhances condensation heat transfer rate even in presence of non condensable gas with variousconcentrations

ارجمند مهرباني

محسن نصراصفهاني

غلامرضا اعتماد، علي اكبر عالم رجبي