Convective heat transfer on a flat plate subjected to normally synthetic jet and horizontally forced flow

Zhang, Jingzhou; Gao, Shan; Tan, Xiaoming

doi:10.1016/j.ijheatmasstransfer.2012.10.035

Cited by 42 publications

(18 citation statements)

References 22 publications

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“…From Eq. (19), such a cooling design can be expressed by E F;c À 1 JIF P sj P max (20) where P sj is the power consumption per jet. Despite being another form of Eq.…”

Section: Experimental Results Of Multiple-jet Testsmentioning

confidence: 99%

“…In the second category, most research effort has been devoted to using synthetic jets to enhance the existing forced convection cooling [17][18][19][20][21]. For example, Utturkar et al [17] presented the cooling performance of synthetic jets complementing forced convection from a fan.…”

Section: Introductionmentioning

confidence: 99%

“…Both experiments and computational fluid dynamics (CFD) computations were performed to investigate the interaction of the jet flow field with a cross flow generated by the fan. The experimental study by Zhang et al [20] focused on the conjugate heat transfer characteristics under an impinging flow of synthetic jet and a steady parallel flow over a flat heated surface. Akdag et al [21] experimentally investigated the heat transfer of a forced parallel flow over a flat surface with a transverse synthetic jet flow placed at the leading edge of the surface.…”

Section: Introductionmentioning

confidence: 99%

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Heat Transfer Impact of Synthetic Jets for Air-Cooled Array of Fins

Gerstler

Arık

et al. 2015

Journal of Heat Transfer

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Free convection air cooling from a vertically placed heat sink is enhanced by upward concurrent pulsated air flow generated by mesoscale synthetic jets. The cooling enhancement is experimentally studied. An enhancement factor is introduced and defined as the ratio of convection heat transfer coefficients for jet-on (enhanced convection) to jet-off (natural convection) cooling conditions. To obtain the two coefficients, heat transfer by radiation is excluded. A high-resolution infrared (IR) camera is used to capture detailed local temperature distribution on the heat sink surface under both cooling conditions. Analysis is carried out to obtain local convection heat transfer coefficients based on measured local surface temperatures. The enhancement of convectional cooling by synthetic jets can be then quantified both locally and globally for the entire heat sink. Two categories of thermal tests are conducted. First, tests are conducted with a single jet to investigate the effects of jet placement and orifice size on cooling enhancement, while multiple jets are tested to understand how cooling performance changes with the number of jets. It is found that the cooling enhancement is considerably sensitive to jet placement. Jet flow directly blowing on fins provides more significant enhancement than blowing through the channel between fins. When using one jet, the enhancement ranges from 1.6 to 1.9 times. When multiple jets are used, the heat transfer enhancement increases from 3.3 times for using three jets to 4.8 times for using five jets. However, for practical thermal designs, increasing the number of jets increases the power consumption. Hence, a new parameter, “jet impact factor (JIF),” is defined to quantify the enhancement contribution per jet. JIF is found to change with the number of jets. For example, the four-jet configuration shows higher JIF due to higher contribution per jet than both three-jet and five-jet configurations.

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“…From Eq. (19), such a cooling design can be expressed by E F;c À 1 JIF P sj P max (20) where P sj is the power consumption per jet. Despite being another form of Eq.…”

Section: Experimental Results Of Multiple-jet Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Heat Transfer Impact of Synthetic Jets for Air-Cooled Array of Fins

Gerstler

Arık

et al. 2015

Journal of Heat Transfer

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show abstract

“…Zhang et al [17] experimentally investigated the conjugate heat transfer characteristics of synthetic jet driven by piston actuator and horizontally forced flow. It is observed that at higher excitation frequencies the convective heat transfer capacity is enhanced under conjugate action of synthetic jet and forced flow.…”

Section: Introductionmentioning

confidence: 99%

Proper cavity shape can mitigate confinement effect in synthetic jet impingement cooling

Bhapkar

Srivastava

Agrawal

2015

Experimental Thermal and Fluid Science

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“…These synthetic jets generally have low Reynolds numbers. For the synthetic jet driven by piston actuator, the excitation frequency is extremely lower while the stroke length is extremely bigger in relative to acoustic or piezoelectric actuators [26][27][28][29]. Therefore, the other objectives of this work are to present the effect of orifice shape (single-round, single-square, and single-rectangular orifices having the same jet exit area) on the synthetic jet impingement driven by piston actuator, and to further identify heat transfer regimes of the synthetic jet with big ratio of stroke length to jet-to-surface spacing (10 < L 0 /s).…”

Section: Introductionmentioning

confidence: 99%