%0 Journal Article
%A Diaz, Daniel
%A Valencia, Alvaro
%D 2017
%I Begell House
%K heat transfer enhancement, heat exchanger, vortex generator
%N 18
%P 1707-1725
%R 10.1615/HeatTransRes.2017018543
%T HEAT TRANSFER IN AN OVAL TUBE HEAT EXCHANGER WITH DIFFERENT KINDS OF LONGITUDINAL VORTEX GENERATORS
%U http://dl.begellhouse.com/journals/46784ef93dddff27,426aee4b0cf838ea,7e3421f47417bed1.html
%V 48
%X A numerical study was performed on a plate fin and oval tube heat exchanger with different kinds of longitudinal vortex generators (LVG). The influence of LVG on heat transfer and pressure drop is investigated, and eight different LVG geometries are compared: delta-type, rectangular, spoon-type, and five ellipse-shaped cases. The numerical study involves a three-dimensional steady and laminar flow and conjugate heat transfer. The results show that one longitudinal vortex (LV) is generated for each LVG for all cases except for the spoon-type case, where two LVs are generated. The results of experimental and numerical investigations were compared validation. The highest increase in heat transfer corresponds to the Delta case (14% for Re_{dh} = 720), followed by the Ellipse 1 (13%), Ellipse 2, Ellipse 5 and Rectangular (11%), Ellipse 3 (8%), and Ellipse 4 and Spoon (7%) cases. The highest increase in the pressure drop corresponds to the Ellipse 1 case (20% for Re_{dh} = 720), followed by the Delta (19%), Ellipse 2 (15%), Ellipse 5 (14%), Rectangular (13%), Ellipse 3 (11%), and
Ellipse 4 and Spoon (9%) cases. The highest heat transfer rate, with the same flow power consumption, corresponds to the Delta, Rectangular, Ellipse 1, 2, and 5 cases.
%8 2017-11-14