سال انتشار: ۱۳۸۶

محل انتشار: پنجمین کنگره بین المللی مهندسی شیمی

تعداد صفحات: ۸

نویسنده(ها):

Hamid Omidvarborna – Department of Chemical Engineering, Isfahan University of Technology, Isfahan
Arjomand Mehrabani-Zeinabad – Department of Chemical Engineering, Isfahan University of Technology, Isfahan
Mohsen Nasr Esfahany – Department of Chemical Engineering, Isfahan University of Technology, Isfahan

چکیده:

In this paper an experimental investigation on electrohydrodynamic (EHD) augmentation of heat transfer for in-tube condensation of flowing refrigerant R-134a in presence of non-condensable gas (NC) is presented. The test section is a 1 m long counter flow heat exchanger. The refrigerant flows in the inner tube and a rod electrode placed in the tube centre. Cooling water flows through the heat exchanger annulus. The effects of electrode rode diameter, presence of non-condensable gas concentration, and application of voltage on condensation are examined. Results show a reduction in heat transfer by factor 2.1 upon presence of 20% of non-condensable gas. In the presence of the 20% of NC and 12mm electrode, a maximum heat transfer enhancement of 1.9 is experienced by applying voltage of 8 kV.