Abstract
The plate fin heat exchanger is a compact heat exchanger applied in many industries because of its high thermal performance. To enhance the heat transfer of plate fin heat exchanger further, three new kinds of wavy plate fins, namely perforated wavy fin, staggered wavy fin and discontinuous wavy fin, are proposed and investigated by computational fluid dynamics (CFD) simulations. The effects of key design parameters, including that of waviness aspect ratios, perforation diameters, staggered ratios and breaking distance are investigated, respectively, with Reynolds number changes from 500 to 4500. It is found that due to the swirl flow and efficient mixing of the fluid, the proposed heat transfer enhancement techniques all have advantages over the traditional wavy fin. At the same time, serration is beneficial to reduce the friction factor, and the breaking technique can reduce heat transfer area. Through the performance evaluation criteria, the staggered wavy fin has an advantage over the small waviness aspect ratio; with increasing waviness aspect ratio, this predominance is gradually surpassed by the perforated wavy fin, and the advantage of the discontinuous fin is the smallest and almost invariable. A maximum performance evaluation criteria (PEC) as high as 1.24 can be obtained for the perforated wavy fin at the waviness aspect ratio γ = 0.45.
Highlights
As a compact heat exchanger, the plate fin heat exchanger is applied in many industries and occupies a unique role due to its flexible arrangement, simple shape, and good thermal effectiveness.Based on different applications, various kinds of fins are used in plate fin heat exchangers, such as plain, offset-strip, louvered, wavy and pin [1,2,3,4,5]
The results show that the waviness amplitude has a significant effect on the heat transfer and pressure drop of wavy fin [9]
It indicates that the perforation and serration techniques are beneficial for the enhancement of. It indicates that the perforation and serration techniques are beneficial for the enhancement of heat transfer at different waviness aspect ratio
Summary
As a compact heat exchanger, the plate fin heat exchanger is applied in many industries and occupies a unique role due to its flexible arrangement, simple shape, and good thermal effectiveness. Juan Du carried out experimental and numerical investigations of the heat transfer and pressure drop characteristics of an offset plate fin heat exchangers for cooling of lubricant oil [8]. 2018, recently, 11, 1398 there has been various research on the development of new types of fin for heat of 18 transfer enhancement [10,11,12], including that of offset strip fins compact heat exchanger [13], fins with grooves or vortex generators [14,15]. The results showed that the wavy fin with delta winglet pairs can significantly enhance air-side heat transfer and showed the[18]. Drop of the plate fin heat exchanger have analyzed
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