Numerical investigation of heat transfer in structured rough microchannels subjected to pulsed flow

Singh, Shashank; Singh, Siddhartha Kumar; Mali, Harlal Singh; Dayal, Ram

doi:10.1016/j.applthermaleng.2021.117361

Cited by 16 publications

(6 citation statements)

References 30 publications

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“…Continuous flow in cooling creates a boundary layer which hinders heat transfer [10]. Pulsating flow may boost heat transfer by disrupting the boundary layer and mixing the fluid [11]. Pulsation flow is transient, which adds complexity to the analytical investigation [84,85].…”

Section: Pulsating Flow On Cpv Coolingmentioning

confidence: 99%

“…In an oscillating flow, the Womersley number expresses the influence of frequency on which force, inertia, or viscosity will dominate. It is given by Equations ( 10) or (11), according to [90]…”

Section: Pulsating Flow On Cpv Coolingmentioning

confidence: 99%

“…Continuous flow in cooling creates a boundary layer that hinders heat transfer [10]. Pulsating flow may boost heat transfer by disrupting the boundary layer and mixing the fluid [11].…”

Section: Introductionmentioning

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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Section: Pulsating Flow On Cpv Coolingmentioning

confidence: 99%

Section: Pulsating Flow On Cpv Coolingmentioning

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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“…The asymmetric flows showed intense fluid mixing with a rapid shift in flow velocity and corresponding pressure gradients led to an enhancement of up to 28% over steady. New works have also focussed on modifying the channel geometries such as by implementing grooved wall [33,34], sinusoidal wavy walls [35,36] or by incorporating surface roughness [37] to achieve promising heat transfer enhancement using pulsating flows. The introduction of recirculation zones and flow separation effectively disrupts the thermal boundary to enhance the mass momentum and thermal diffusion between wall and core, although with a sharp escalation in pressure gradient.…”

Section: Heat Transfer Associated With Flow Pulsationsmentioning

confidence: 99%

A computational conjugate heat transfer study of a rectangular minichannel undergoing sinusoidal flow pulsations

Kumavat

Alimohammadi

O’Shaughnessy

2022

International Journal of Thermal Sciences

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“…They found 3%-8% of performance enhancement due to the pulsating effect. Singh et al 12 numerically, studied the effect of frequencies in pulsed flow, on thermal performance of triangular-structured rough microchannels, having different hydraulic diameters. They found heat transfer enhancement in comparison with continuous flow and obtained optimum frequencies for different diameters.…”

Section: Introductionmentioning

confidence: 99%

Pulsed-flow microchannel heat sink: Simulation and experimental validation

Singh

Mali

Suryawanshi

2021

Journal of Micromanufacturing

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Microchannel heat dissipation devices were first conceptualized in 1981 and since then are at the forefront of cooling techniques for a variety of applications, extending from computer chips and turbine blades to lasers and optical systems. However, much of the research is concentrated on steady flow of a cooling fluid through the channels. In this article, transient two-dimensional (2D) simulation for heat transfer in microchannels under a pulsed-flow condition is carried out. For validation of simulation results, a novel heat sink device is designed and fabricated, using milling and micro-electric discharge machining (EDM) technique. The fabricated device is then tested to evaluate the effect of a variable flow rate on the heat transfer characteristics when the flow is pulsating. It is found that the numerical results underpredict slightly as compared to actual experimental results. Results indicate a higher temperature at the outlet of the heat sink device for lower pulse frequency, and as pulse frequency increases, the outlet temperature decreases.

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Numerical investigation of heat transfer in structured rough microchannels subjected to pulsed flow

Cited by 16 publications

References 30 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

A computational conjugate heat transfer study of a rectangular minichannel undergoing sinusoidal flow pulsations

Pulsed-flow microchannel heat sink: Simulation and experimental validation

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