An experimental investigation of the flow-field and thermal characteristics of synthetic jet impingement with different waveforms

Singh, Pushpanjay K.; Renganathan, M.; Yadav, Harekrishna; Sahu, Santosh Kumar; Upadhyay, Prabhat K.; Agrawal, Amit

doi:10.1016/j.ijheatmasstransfer.2022.122534

Cited by 21 publications

(4 citation statements)

References 37 publications

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“…Singh vd. [43] farklı dalga formları (kare-sinüs), Reynolds sayıları (1656-2218), boyutsuz eksenel mesafe ve dalga periyodlarının (100-175 Hz) sentetik jet ile yapılan soğutmaya etkilerini deneysel olarak incelemişlerdir. Albayrak vd.…”

Section: Gi̇ri̇ş (Introduction)unclassified

Elektronik Bileşenlerin Bir Çift Slot Jet ile Soğutulmasında Nozül Konumunun Soğutma Performansına Etkisi

2024

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Bu çalışmada, elektronik bileşenlerin bir çift slot jet ile soğutulmasında nozül konumunun akış yapısı ve taşınımla ısı transfer karakteristiklerine etkileri sayısal olarak incelenmiştir. Nozül genişlikleri ve jet Reynolds sayıları eşit alınarak dört farklı nozül konumu (JK 1-2, JK 1-3, JK 1-4 ve JK 1-5) için Reynolds sayısının 100 ile 500 değerleri arasında, laminer rejimde iki-boyutlu hesaplamalar gerçekleştirilmiştir. Sayısal hesaplamalar ANSYS Fluent yazılımı ile yürütülürken, farklı Reynolds sayıları ve jet konumları için hız ve sıcaklık konturları, ısı kaynaklarının yüzeylerinde yerel ve ortalama Nusselt sayılarının değişimi ve genel ortalama Nusselt sayısının değişimi incelenmiştir. Çalışma sonucunda, akış yapısı ve taşınımla ısı transfer karakteristiklerinin nozül konumundan oldukça etkilendiği, sistemin geneli için taşınımla ısı transfer hızının JK 1-2’de diğer durumlara oranla daha yüksek olduğu ve ikinci nozülün çıkışa doğru kayması ile birlikte taşınımla ısı transfer hızının sistemin geneli için azaldığı belirlenmiştir.

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Section: Gi̇ri̇ş (Introduction)unclassified

Elektronik Bileşenlerin Bir Çift Slot Jet ile Soğutulmasında Nozül Konumunun Soğutma Performansına Etkisi

2024

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“…On the other hand, linear momentum is transferred to the fluid [2]. Synthetic jets have been utilized in various applications such as active flow control applications including control of boundary layer transformation/detachment, lift enhancement and drag reduction, underwater vehicle propulsion, heat transfer enhancement by cooling of microprocessors in electronics industry, and mixing augmentation [3,4]. Especially the development in electronics has led to an increase in heat loads in compact volumes.…”

Section: Introductionmentioning

confidence: 99%

“…Singh et al [4] investigated the circular synthetic jet impingement heat transfer under different waveforms experimentally. Investigations were performed for different Re numbers, dimensionless nozzle-to-plate spacing of 1-25, and frequencies.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of single and multiple impinging synthetic jets on the flow field and heat transfer at low orifice-to-plate distances

Ergur,

Calisir

2023

FME Transactions

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In the present numerical study, the thermal performance and fluid flow properties have been investigated to show the effect of single-orifice and multiple-orifice impingement of synthetic jets for dimensionless orifice-toplate distance (H/D) of lower than one. Investigations have been done for an actuation frequency of f=500 Hz, 0.10 ≤ H/D ≤ 0.75, and dimensionless pitch ratio of 1.25 ≤ Do/D ≤ 1.75. The results were validated with experimental results from the literature, and a fair agreement was obtained. The results showed that at low nozzle-to-plate spacing, lower target plate temperatures could be obtained. It was observed that with the use of multiple orifices at especially higher Do/D higher heat transfer values are present. The study was performed to add knowledge to the electronics and aviation industries where high temperatures in small cavities occur.

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“…As a novel flow control technology, synthetic jets could initiate large-scale effect by exerting micro-scale disturbances to the macroscopic flow field, and an external fluid is not necessary (Singh et al 2022). The boundary layer separation on a circular cylinder can be effectively delayed in both blowing and suction strokes of synthetic jets (Wang et al 2017).…”

Section: Introductionmentioning

confidence: 99%

The influence of reduced velocity on the control of two-degree-of-freedom vortex induced vibrations of a circular cylinder via synthetic jets

Wang¹,

Yu²,

Sun³

et al. 2022

Fluid Dyn. Res.

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A two-dimensional numerical study is conducted to investigate the influence of the reduced velocity on two-degree-of-freedom VIVs of a circular cylinder controlled by synthetic jets ejected in horizontal and vertical directions (β = 0° and β = 90°). The Reynolds number is constant at Re = 150, and the reduced velocity varies in the range of 2.5 and 15 (U* = 2.5-15). The mass ratio of the circular cylinder is 2,0, and the in-flow to the cross-flow natural frequency ratio equals 1.0 (fnx/fny = 1.0). The oscillation characters, hydrodynamic forces and vortex shedding of circular cylinders with or without synthetic jets control are analyzed and compared. The results indicate that synthetic jets ejected in vertical direction (β = 90°) can intensify both in-flow and cross-flow oscillations of the circular cylinder in the whole reduced velocity range, the vortex shedding of the controlled case (β = 90°) becomes complicated even unstable with the reduced velocity increasing. Synthetic jets ejected in horizontal direction (β = 0°) have excellent performance on suppressing the cross-flow oscillation of the circular cylinder in the whole reduced velocity range. When U* ≥ 8.0, the in-flow oscillation of the circular cylinder can even be intensified by synthetic jets ejected in horizontal direction (β = 0°).

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An experimental investigation of the flow-field and thermal characteristics of synthetic jet impingement with different waveforms

Cited by 21 publications

References 37 publications

Elektronik Bileşenlerin Bir Çift Slot Jet ile Soğutulmasında Nozül Konumunun Soğutma Performansına Etkisi

Elektronik Bileşenlerin Bir Çift Slot Jet ile Soğutulmasında Nozül Konumunun Soğutma Performansına Etkisi

Numerical investigation of single and multiple impinging synthetic jets on the flow field and heat transfer at low orifice-to-plate distances

The influence of reduced velocity on the control of two-degree-of-freedom vortex induced vibrations of a circular cylinder via synthetic jets

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