Effect of intermittent and sinusoidal pulsed flows on impingement heat transfer from a concave surface

Mohammadpour, Javad; Rajabi-Zargarabadi, Mehran; Mujumdar, Arun S.; Ahmadi, Hadi

doi:10.1016/j.ijthermalsci.2013.08.018

Cited by 30 publications

(8 citation statements)

References 19 publications

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“…To better understand the flow behaviour of the fluid in our device as well as the heat transfer during the freezing and thawing process, numerical simulations were performed using ANSYS Fluent 2020R2 (ANSYS, USA) [22,23]. The fluid flow was performed using a 2D and 3D laminar single-phase solver to understand the flow rate through the trap opening compared to the main channel.…”

Section: Numerical Simulationmentioning

confidence: 99%

An easy-to-operate method for single-cell isolation and retrieval using a microfluidic static droplet array

et al. 2021

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In-depth study of cellular heterogeneity of rare cells (e.g. circulating tumour cells (CTCs) and circulating foetal cells (CFCs)) is greatly needed in disease management but has never been completely explored due to the current technological limitations. We have developed a retrieval method for single-cell detection using a static droplet array (SDA) device through liquid segmentation with almost no sample loss. We explored the potential of using SDA for low sample input and retrieving the cells of interest using everyday laboratory equipment for downstream molecular analysis. This single-cell isolation and retrieval method is low-cost, rapid and provides a solution to the remaining challenge for single rare cell detection. The entire process takes less than 15 min, is easy to fabricate and allows for on-chip analysis of cells in nanolitre droplets and retrieval of desired droplets. To validate the applicability of our device and method, we mimicked detection of single CTCs by isolating and retrieving single cells and perform real-time PCR on their mRNA contents.

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Section: Numerical Simulationmentioning

confidence: 99%

An easy-to-operate method for single-cell isolation and retrieval using a microfluidic static droplet array

et al. 2021

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“…It was shown that the Nusselt number was independent of inlet jet temperatures. Mohammadpour et al [7] investigated the influence of pulsating flows on jet impingement heat transfer of a concave surface. They found that a turbulent slot jet with intermittent waves provided higher heat transfer than sinusoidal waves.…”

Section: Introductionmentioning

confidence: 99%

A detailed analysis of flow and heat transfer characteristics under a turbulent intermittent jet impingement on a concave surface

2022

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A computational study is carried out of the three-dimensional flow field and heat transfer under a turbulent intermittent circular jet impingement on a concave surface. The control-volume procedure with the SIMPLE algorithm is employed to solve the unsteady RANS (use full form) equations. The RNG k-? model is implemented to simulate turbulence due to its success in predicting similar flows. The numerical results are validated by comparing them with the experimental data. The effects of jet Reynolds number and oscillation frequency on the flow and heat transfer are evaluated. The profiles of instantaneous and time-averaged Nusselt numbers exhibit different trends in axial (x) and circumferential (s) directions. It is found that increasing frequency from 50 to 200 Hz results in considerable time-averaged Nusselt number enhancement in both axial and curvature directions. The intermittent jet at a frequency of 200 Hz enhances the total average Nusselt number by 51.4%, 40%, and 33.7% compared to the steady jet values at jet Reynolds numbers of 10000, 23000, and 40000, respectively. In addition, a correlation for the average Nusselt number is proposed depending on the Reynolds number and the Strouhal number.

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“…The numerical studies of flow patterns and heat transfer in pulsed jet impingement were carried out in [21][22][23][24][25]. The RANS predictions were performed on the commercial CFD package FLUENT in a slot impinging jet in the presence of a confined upper wall with varying pulse frequencies.…”

Section: Introductionmentioning

confidence: 99%

“…In the region of small distances between the pipe outlet and impinging surface (H/D ≤ 6) in the pulsed jet, heat transfer at the stagnation point increases with increasing pulse frequency, while for H/D > 8, an increase in frequency causes a decrease in heat transfer. The authors of [24] numerically studied the heat transfer in a jet impingement onto a spherical surface. The simulation was carried out using the commercial package FLUENT.…”

Section: Introductionmentioning

confidence: 99%

RANS Simulation of the Effect of Pulse Form on Fluid Flow and Convective Heat Transfer in an Intermittent Round Jet Impingement

Пахомов

Терехов

2020

Energies

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The of effect pulse form (rectangular, sinusoidal and triangular) on the fluid flow and heat transfer of an intermittent jet impingement was studied numerically. It was shown in a non-steady-state jet, both an increase and decrease in heat transfer are possible compared with steady-state jet for all investigated pulse forms. For small distances between the pipe edge and obstacle (H/D ≤ 6) in the pulsed jet, heat transfer around the stagnation point increases with increasing pulse frequency, while for H/D > 8 an increase in frequency causes a heat transfer decrease. A growth in the Reynolds number causes a decrease in heat transfer, and data for all frequencies approach the steady-state flow regime. The numerical model is compared with the experimental results. Satisfactory agreement on the influence of the form and frequency of pulses on heat transfer for the pulsed jet on the obstacle surface is obtained.

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Effect of intermittent and sinusoidal pulsed flows on impingement heat transfer from a concave surface

Cited by 30 publications

References 19 publications

An easy-to-operate method for single-cell isolation and retrieval using a microfluidic static droplet array

An easy-to-operate method for single-cell isolation and retrieval using a microfluidic static droplet array

A detailed analysis of flow and heat transfer characteristics under a turbulent intermittent jet impingement on a concave surface

RANS Simulation of the Effect of Pulse Form on Fluid Flow and Convective Heat Transfer in an Intermittent Round Jet Impingement

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