Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9690302 | Applied Thermal Engineering | 2005 | 13 Pages |
Abstract
Local heat transfer coefficients were measured on fin-tube heat exchanger with winglets using a single heater of 2 inch diameter and five different positions of winglet type vortex generators. The measurements were made at Reynolds number about 2250. Flow losses were determined by measuring the static pressure drop in the system. Results showed a substantial increase in the heat transfer with winglet type vortex generators. It has been observed that average Nusselt number increases by about 46% while the local heat transfer coefficient improves by several times as compared to plain fin-tube heat exchanger. The maximum improvement is observed in the re-circulation zone. The best location of the winglets was with ÎXÂ =Â 0.5D and ÎYÂ =Â 0.5D. The increase in pressure drop for the existing situation was of the order of 18%.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
S.M. Pesteei, P.M.V. Subbarao, R.S. Agarwal,