Title :
Electrohydrodynamic enhancement of R-134a condensation on enhanced tubes
Author :
Silva, L. W Da ; Molki, M. ; Ohadi, M.M.
Author_Institution :
Dept. of Mech. Eng., Maryland Univ., College Park, MD, USA
Abstract :
The enhancement of condensation heat transfer is of practical importance in many industries such as HVAC, power, and aerospace. The present work is concerned with the electrohydrodynamic (EHD) enhancement of external condensation on single commercial enhanced tubes. Future phases of this work will include applying the technique to practical heat exchangers and developing a prototype EHD condenser. Single-tube experiments were performed on two types of enhanced tubes. The refrigerant was R-134a, with the EHD voltage in the range 0 to 25 kV, saturation temperature 10 to 40°C, and heat flux 10 to 40 kW/(m2K). The results indicated that the external heat transfer coefficient significantly increased under the effect of electrical field. The optimum heat transfer enhancement was approximately 3-fold for either tube, with respective EHD power consumption lower than 1% of the test section heat transfer rate
Keywords :
condensation; electrohydrodynamics; heat transfer; 0 to 25 kV; 10 to 40 C; EHD power consumption; EHD voltage; R-134a condensation; R-134a refrigerant; electrical field effect; electrohydrodynamic enhancement; enhanced tubes; external condensation; external heat transfer coefficient; heat flux; heat transfer rate; optimum heat transfer enhancement; saturation temperature; Aerospace industry; Electrohydrodynamics; Energy consumption; Heat transfer; Prototypes; Refrigerants; Resistance heating; Temperature distribution; Testing; Voltage;
Conference_Titel :
Industry Applications Conference, 2000. Conference Record of the 2000 IEEE
Conference_Location :
Rome
Print_ISBN :
0-7803-6401-5
DOI :
10.1109/IAS.2000.881915
