In-tube boiling heat transfer enhancement of R-123 using the EHD technique

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:33299

Singh, A; Chu, W; Ohadi, M M; Dessiatoun, S ^[1]

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1. Univ. of Maryland, College Park, MD (United States)

The applicability of the electrohydrodynamic (EHD) technique for in-tube boiling heat transfer enhancement of R-123 was investigated experimentally. The test rig consisted of a tube-in-tube heat exchanger with hot water flowing in the outer tube and the test refrigerant flowing in the inner tube. The experiment utilized a stainless steel cylindrical electrode with an outer diameter (OD) of 3 mm (0.118 in.) placed coaxially in the test section, which was a 1.22 m (4 ft) long, smooth, stainless steel tube with an inner diameter of 9.4 mm (0.37 in.). The experiments were performed as a function of parametric values of inlet quality, heat flux, and mass flux. It was found that R-123 exhibits an excellent response to the EHD effect. An increase in the heat transfer coefficient of as high as 550% was obtained when compared to the base case (absence of EHD effect). In the worst case, the electrical power consumption penalty was found to be less than 0.27% of the corresponding test section`s heat transfer rate.

• OSTI ID: 33299
• Report Number(s): CONF-9406105--
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
54 ENVIRONMENTAL SCIENCES
AUGMENTATION
BOILING
CHLOROFLUOROCARBONS
HEAT TRANSFER
MATERIAL SUBSTITUTION
REFRIGERANTS
TUBES