Abstract
Vortex generators (VGs) are one of the effective passive models used to increase the heat transfer rate in heat exchangers. In this experiment, heat transfer from six cylinders heated to the airflow was improved by attaching rectangular winglet vortex generators (RWVGs) to a plate in a rectangular channel. The installation aimed to increase the value of the thermal-hydraulic performance evaluation criteria in the line. This experimental study was carried out by varying the fluid flow velocity from 0.4 m/s to 2 m/s with an interval of 0.2 m/s in the channel. Three pairs of VGs were arranged in both in-line and staggered configurations. The experimental results show that the thermal-hydraulic performance evaluation criteria for three pairs of vortex generators in the staggered configuration was 15.17% higher than the baseline, while the thermal-hydraulic performance of the in-line arrangement was 1.54% higher than the staggered one.
Highlights
The use of household and industrial air conditioning is increasing
Given the findings discussed above, the experiments carried out in this study investigated the effects on thermalhydraulic performance of three pairs of rectangular winglet vortex generators (RWVGs) arranged inline and staggered on the plate in the channel based on the ratio of the Colburn factor (j) to the friction factor (f)
The effects of the RWVGs on thermal-hydraulic (a) performance were studied by comparing the baseline performance evaluation criterion (PEC) to the PEC when arranged in-line and staggered, with the addition of three pairs of RWVGs in a rectangular channel passing through six heated cylinders
Summary
The use of household and industrial air conditioning is increasing. Improving thermal-hydraulic performance of air conditioning components is of concern to researchers. The passive method (using a vortex generator) is an effective way to improve the hydraulic thermal performance of heat exchangers. Samadifar et al studied the numerical effects of VGs on thermal hydraulic performance in plate fin heat exchangers [1] and found that using rectangular VGs on the fin plate resulted in maximum thermal-hydraulic performance. Han et al the shapes of VGs, such as modified rectangular winglet vortex generators (RWVGs), influence thermalhydraulic performance [2]. H. Ling Liu et al modified the heights of the RWVGs [3], while H. Naik et al used modified RWVGs with concave shapes to improve thermal-hydraulic performance [4]
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