Heat Transfer Enhancement with Considering Pressure Loss Penalty of Airflow through Heated Plate Mounted by Perforated Concave Rectangular Winglet Vortex Generators

摘要

The use of longitudinal vortex generator results in decreased hydrodynamic flow performance by increasing pressure drop values.The purpose of this research is to obtain the improvement of heat transfer with pressure drop as low as possible.In order to achieve this purpose,experiment was performed on perforated concave rectangular winglet pair vortex generators(CRWP VGs).The test results show that the CRWP VGs without hole increase thermal performance by 24.02% up to 129.75% against baseline(without using any vortex generators)and by 12,21 % up to 19,41 % against rectangular winglet pair vortex generator(RWP VG).The pressure drop value for the CRWP VGs case increased by more than 10 times against the baseline case and increased by almost 100% against RWP VGs case.By using the perforated CRWP VGs,pressure drop value can be reduced by 15.07% to 72.73% followed by a slight decrease in thermal performance of 5.50% to 5.73% against the CRWP VGs without hole.Based on the evaluation using London goodness factor criteria,perforated CRWP VGs is better than the CRWP VGs without hole.