Heat transfer enhancement and optimization of flat-tube multilouvered fin compact heat exchangers with delta-winglet vortex generators

Forced convection on grey cast iron plate-fins: Prediction of the heat transfer coefficient

“…The results indicate that the configurations of optimized vortex generators led to heat transfer enhancement rates higher than those reported in the literature. In other recent work, (viii) Dezan et al [9] adopt the surrogate-based optimization procedure to maximize heat transfer for two basic geometries of multilouvered fin compact heat exchangers with delta-winglet vortex generators. According to the authors, when comparing with the respective baseline geometry (louvered fin without vortex generators), the results show that optimized solutions increase the heat transfer a minimum of 13.48% with associated pressure loss increasing around 20%.…”

“…In order to conclude the present literature review, it is important to emphasize that some recent works have applied optimization procedures to determine technical parameters of finned heat exchangers [7][8][9]; along this route, (vi) Kotcioglu et al [7] describe an experimental investigation for determination of optimum values of the design parameters in a plate-fin heat exchanger by using Taguchi method. The authors present experimental results which validate the suitability of the proposed approach.…”

“…In the present work a hybrid numerical/experimental approach is proposed to assess the convective heat transfer coefficient in a plate-fin heat exchanger. Distinctly from the aforementioned references [1][2][3][4][5][6][7][8][9] that address stainless steel and aluminium fins, the present study is applied to cast iron plate-fins which are typically used in cooling electric motors. In order to ensure velocity uniformity, the experimental tests were performed in a wind tunnel.…”

“…The main objective of the investigations has been to examine the effects of the flow parameters on heat transfer at finned surfaces and to estimate the convective heat transfer coefficient [1][2][3][4][5][6][7][8][9]. Within this framework, focusing on both numerical and experimental works with practical applications, one finds the following studies: (i) Chen and Hsu [1] and Chen et al [2] present two similar works proposing an hybrid methodology to obtain the heat transfer coefficient on fins of annular-finned tube heat exchanger in natural/forced convection; The authors applied the finite difference method in conjunction with the least-squares scheme and temperature measurements to predict the average heat transfer coefficient; Finally, a parametric study was performed and the main results indicate that the average heat coefficient increases with increasing fin spacing.…”

Using proper orthogonal decomposition to solve heat transfer process in a flat tube bank fin heat exchanger

“…For the requirements the consistency of "heat transfer capacity, volume, energy consumption" of the heat exchanger in the industrial application, the tube spacing (Wang et al, 2010;Song et al, 2011;Wang et al, 2018), fin spacing (Hu et al, 2013;, fin material (Lizardi et al, 2004;Gai et al, 2010), fin structure (Han et al, 2013;Lin et al, 2014;Arora et al, 2015;Wei et al, 2016;Capata and Beyene, 2017;Guo et al, 2017;Agbossou et al, 2018), fluid flow parameters (Wang et al, 2012a;Lin et al, 2014) and other aspects of the heat exchanger heat transfer performance were studied. The heat transfer performance of the fin with vortex generators (VGs) punched on the fin surface also be studied (Wang et al, 2010;Aliabdi et al, 2016;Dezan et al, 2016;Salviano et al, 2016;Väalikangas et al, 2018). When the area goodness factor was used as the criteria on the condition of one tube unit of heat exchanger for commonly used fin materials and fin thickness, the transversal tube pitch has considerable effect on the heat transfer enhancement of VGs.…”