Effects of the shape of tube and flow field on fluid flow and heat transfer

Zhang, Liang; Tian, Linchao; Zhang, Anlong; Chen, Hemin

doi:10.1016/j.icheatmasstransfer.2020.104782

Cited by 9 publications

(8 citation statements)

References 6 publications

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“…fluid [11]. Research shows that pulsating flow enhances heat transfer [12][13][14][15][16]. Most studie report cooling techniques based on a steady, continuous coolant flow.…”

Section: Photovoltaics Current State Of the Art 21 Classificationsmentioning

confidence: 99%

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Cooling of Concentrated Photovoltaic Cells—A Review and the Perspective of Pulsating Flow Cooling

2023

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This article presents a review to provide up-to-date research findings on concentrated photovoltaic (CPV) cooling, explore the key challenges and opportunities, and discuss the limitations. In addition, it provides a vision of a possible future trend and a glimpse of a promising novel approach to CPV cooling based on pulsating flow, in contrast to existing cooling methods. Non-concentrated photovoltaics (PV) have modest efficiency of up to around 20% because they utilise only a narrow spectrum of solar irradiation for electricity conversion. Therefore, recent advances employed multi-junction PV or CPV to widen the irradiation spectrum for conversion. CPV systems concentrate solar irradiation on the cell’s surface, producing high solar flux and temperature. The efficient cooling of CPV cells is critical to avoid thermal degradation and ensure optimal performance. Studies have shown that pulsating flow can enhance heat transfer in various engineering applications. The advantage of pulsating flow over steady flow is that it can create additional turbulence and mixing in the fluid, resulting in a higher heat transfer coefficient. Simulation results with experimental validation demonstrate the enhancement of this new cooling approach for future CPV systems. The use of pulsating flow in CPV cooling has shown promising results in improving heat transfer and reducing temperature gradients.

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“…fluid [11]. Research shows that pulsating flow enhances heat transfer [12][13][14][15][16]. Most studie report cooling techniques based on a steady, continuous coolant flow.…”

Section: Photovoltaics Current State Of the Art 21 Classificationsmentioning

confidence: 99%

“…Energies 2023, 16,2842 4 of 24 Substantial research on concentrated photovoltaic cooling (CPVC) is ongoing globally. Statistics over the previous decade (2012)(2013)(2014)(2015)(2016)(2017)(2018)(2019)(2020)(2021)(2022) show the rising interest and the relevance of CPV cooling technology.…”

Section: Concentrated Photovoltaic Coolingmentioning

confidence: 99%

Cooling of Concentrated Photovoltaic Cells—A Review and the Perspective of Pulsating Flow Cooling

2023

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“…The effects of various material properties on momentum, temperature, and species concentration, as well as values relating to engineering considerations such as the skin friction coefficient, rate of energy transfer, and Sherwood number, were calculated and graphed. We assessed recent attempts on heat transfer development in Newtonian and non-Newtonian fluid models with various physical effects in [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Newtonian Heating Convective Flow by Way of Two Different Surfaces

et al. 2022

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In this paper, we offer a numerical study on heated non-Newtonian fluid with a Newtonian heating effect towards thermally stable stretching surfaces. A comparative analysis for two stretched surfaces, namely, plate and cylinder, is offered. The Casson fluid model is considered to be a non-Newtonian fluid model. By applying the suitable set of transformations, the non-linear coupled PDEs are transformed into non-linear ODEs. It is difficult to obtain the exact solution of such non-linear differential equations; therefore, we used the shooting method along with Runge–Kutta scheme. The influence of pertinent flow variables on velocity and temperature is presented through graphs. Notably from the results, heat generation parameters, Newtonian heating, and magnetic parameters enhanced the temperature profile, whereas Casson fluid and magnetic field parameters reduced the fluid velocity. It is also observed that increases in fluid temperature were more influenced at the cylindrical surface as compared with the flat plate. Moreover, we obtained remarkable results for the heat transfer rate by imposing Newtonian heating conditions at the surface; tables are used to present variations in the skin friction coefficient and Nusselt number at the thermally stable surfaces.

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“…Among the techniques used to minimize this thermal resistance is the change in the bundle arrangement and shapes fins and tubes. To improve the overall heat transfer and flow characteristics of heat exchangers, a number of geometric parameters are applied [3][4][5][6][7]. On the other hand, changing the forms and configurations of the tubes in sinusoidal wavy fins, remains a viable strategy for improving heat transfer properties while incurring a pumping power penalty.…”

Section: Introductionmentioning

confidence: 99%

Numerical study to predict optimal configuration of wavy fin and tube heat exchanger with various tube shapes

et al. 2022

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This paper aims to investigate the influence of tube shapes on thermal-flow characteristics of sinusoidal wavy finned-tube heat exchangers. Two row staggered bundle with six geometries of tubes (four flat tube geometries, one oval tube and a circular tube) are analyzed for a range of (1600 Re 4800). The inspection revealed that the heat flux and the pressure drop decrease with the tube flatness for all Reynolds values. However, the oval tube O1 reaches, for all Reynolds values, the lowest values of heat flux and pressure drop. Regarding the global performance criterion, the sinusoidal wavy fins with O1 shaped tubes reached the highest global performance values, being 14.8–24.4% and 31.6–36.3% higher than the fin with F1 and O2 tube geometry, respectively.

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Effects of the shape of tube and flow field on fluid flow and heat transfer

Cited by 9 publications

References 6 publications

Cooling of Concentrated Photovoltaic Cells—A Review and the Perspective of Pulsating Flow Cooling

Cooling of Concentrated Photovoltaic Cells—A Review and the Perspective of Pulsating Flow Cooling

Numerical Analysis of Newtonian Heating Convective Flow by Way of Two Different Surfaces

Numerical study to predict optimal configuration of wavy fin and tube heat exchanger with various tube shapes

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