Effect of oscillation frequency on wall shear stress and pressure drop in a rectangular channel for heat transfer applications

Blythman, Richard; Persoons, Tim; Jeffers, Nicholas; Murray, D. G.

doi:10.1088/1742-6596/745/3/032044

Cited by 9 publications

(7 citation statements)

References 9 publications

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“…This effect can lead to flow reversal near the channel walls in pulsatile flows. 44,[46][47][48][49] In the experiment shown in Fig. 6, we find Wo ≈ 0.05, similar to the flow in arterioles at a heartbeat rate of f = 2 Hz.…”

Section: Resupporting

confidence: 70%

Optimizing pressure-driven pulsatile flows in microfluidic devices

2021

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Section: Resupporting

confidence: 70%

Optimizing pressure-driven pulsatile flows in microfluidic devices

2021

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“…In the hydrodynamic (or viscous) regime, pulsatile and oscillatory pressure-driven fully developed flows, through channels of various cross sections, have received, over the years, considerable attention. [1][2][3][4][5][6][7][8][9][10][11][12] Superimposing the oscillatory flow and the corresponding steady-state flow yields the pulsatile pressure driven flow. 4 Mathematical treatment of pulsatile flows in various geometries includes the Fourier expansion, 5 Laplace transform, 6 and Green functions.…”

Section: Introductionmentioning

confidence: 99%

“…Pulsatile and oscillatory flows, mainly due to their technological interest (e.g., flow propagation and control, reducing fouling, promoting mixing, heat and mass exchange, photonics and electronics cooling, aero-acoustics, and thermo-acoustics), remain an active area of research. [9][10][11][12] In the slip, transition, and free molecular regimes, however, where in addition to the oscillation frequency, the level of gas rarefaction plays a significant role in the flow properties and patterns; the corresponding work in rarefied pulsatile gas flows is very limited. Since these flows have not been investigated so far, there is both theoretical and technological interest.…”

Section: Introductionmentioning

confidence: 99%

Pulsatile pressure driven rarefied gas flow in long rectangular ducts

Tsimpoukis

Valougeorgis

2018

Physics of Fluids

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The pulsatile pressure driven fully developed flow of a rarefied gas through an orthogonal duct is investigated, based on the time-dependent linear Bhatnagar, Gross, and Krook equation, by decomposing the flow into its steady and oscillatory parts. The investigation is focused on the oscillatory part, which is characterized by the gas rarefaction and oscillation parameters, the duct aspect ratio, and the accommodation coefficient. As the oscillation frequency is increased, the amplitude of all macroscopic quantities is decreased, while their phase angle lag is increased reaching the limiting value of π/2. As the gas becomes more rarefied, higher frequencies are needed to trigger this behavior. At small and moderate frequencies, there is a critical degree of gas rarefaction, where a maximum flow rate is obtained. As the duct aspect ratio is decreased and tends to zero, the flow rate and mean wall shear stress amplitudes are increased, while their phase angle lags are slightly affected. The accommodation coefficient has a significant effect on the amplitude and a very weak one on the phase angle of the macroscopic quantities. The computation of the inertia and viscous forces clarifies when the flow consists of only one oscillating viscous region or of two regions, namely, the inviscid piston flow in the core and the oscillating Stokes layer at the wall with the velocity overshooting. Finally, the time average oscillatory pumping power is increased as the oscillation frequency is reduced and its maximum value is one half of the corresponding steady one.

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“…Over time, Fourier, Laplace, Green and a number of other mathematical methods have been adopted for solving the governing equations. The chronologic development and the state of the art for analytical solutions of the oscillating internal flow have been presented Blythman et al, (2016). The earliest direct solution for the velocity profile of an oscillatory flow pipe was provided by Richard and Tyler (1929) and is given as follows:…”

Section: Velocity Profilementioning

confidence: 99%

Mechanically Driven Oscillating Flow Cooling Loops – A Review

Cao¹,

Alam²,

Popoola³

2019

Frontiers in Heat and Mass Transfer

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The significant increase in the heat dissipation associated with the increased throughput in computing, renewable energy, and electric vehicles has become a limitation to the evolution of these technologies. The needs for more effective thermal-management methods for higher heat fluxes and more uniform temperature have resulted in the development of mechanically driven oscillating flow cooling systems. The objective of this paper is to review the state-of-the-art of mechanically driven oscillating flow loops (MDOFLs) in terms of several aspects such as heat transfer, fluid mechanics, and thermodynamic principles. In each aspect, essential formulas and related sciences from prior studies are presented to show what has been accomplished in the field. Important parameters on the performance of the cooling systems and challenges for future research are also provided.

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Effect of oscillation frequency on wall shear stress and pressure drop in a rectangular channel for heat transfer applications

Cited by 9 publications

References 9 publications

Optimizing pressure-driven pulsatile flows in microfluidic devices

Optimizing pressure-driven pulsatile flows in microfluidic devices

Pulsatile pressure driven rarefied gas flow in long rectangular ducts

Mechanically Driven Oscillating Flow Cooling Loops – A Review

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