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Research Papers

Combined Influence of Synthetic Jet and Surface-Mounted Rib on Heat Transfer in a Square Channel

[+] Author and Article Information
Adnan Qayoum

Mechanical Engineering Department,
National Institute of Technology Srinagar,
Hazratbal Srinagar, Jammu
and Kashmir 190006, India
e-mail: adnan@nitsri.net

P. K. Panigrahi

Mechanical Engineering Department,
Indian Institute of Technology Kanpur,
Kanpur, Uttar Pradesh 208016, India
e-mail: panig@iitk.ac.in

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received April 30, 2014; final manuscript received May 13, 2015; published online August 11, 2015. Assoc. Editor: P. K. Das.

J. Heat Transfer 137(12), 121004 (Aug 11, 2015) (12 pages) Paper No: HT-14-1265; doi: 10.1115/1.4030918 History: Received April 30, 2014

This investigation reports the combined effect of synthetic jet and a surface-mounted rib on heat transfer in a square cross-section channel flow. The rib height to hydraulic diameter ratio is equal to 0.1625. The Reynolds number of the channel has been set equal to 5500. The synthetic jet actuator has been operated at different actuation voltages with different amplitude modulation frequencies. At actuation voltage of 55 V, the maximum overall heat transfer is enhanced by 132.6% compared with smooth duct flow.

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Figures

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Fig. 1

The schematic of the experimental set

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Fig. 8

The u′ spectra behind Jet2 at y/D = 6, x/D = 20, 33, and 53 for different actuation conditions: (Vexc = 20 V; Vexc = 30 V; Vexc = 55 V; Vexc = 30 V (fAM = 10 Hz); and Vexc = 30 V (fAM = 50 Hz)). The dotted line represents the unexcited case.

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Fig. 7

The u′ spectra behind Jet1 at y/D = 6, x/D = 20, 33, and 53 for different actuation conditions: (Vexc = 20 V; Vexc = 30 V; Vexc = 55 V; Vexc = 30 V (fAM = 10 Hz); and Vexc = 30 V (fAM = 50 Hz)). The dotted line represents the unexcited case.

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Fig. 6

Nondimensional rms velocity (vrms/Uavg) profiles behind Jet1 and Jet2 exposed to incoming laminar boundary layer at various streamwise locations, x/D = 20, 33, and 53 for different actuation conditions: (a) Vexc = 20 V, (b) Vexc = 30 V, (c) Vexc = 55 V, (d) Vexc = 30 V (fAM = 10 Hz), and (e) Vexc = 30 V (fAM = 50 Hz). The hollow symbol represents the unexcited case.

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Fig. 5

Nondimensional rms velocity (urms/Uavg) profiles behind Jet1 and Jet2 exposed to incoming laminar boundary layer at various streamwise locations, x/D = 20, 33, and 53 for different actuation conditions: (a) Vexc = 20 V, (b) Vexc = 30 V, (c) Vexc = 55 V, (d) Vexc = 30 V (fAM = 10 Hz), and (e) Vexc = 30 V (fAM = 50 Hz). The hollow symbol represents the unexcited case.

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Fig. 4

Nondimensional mean velocity (v/Uavg) profiles behind Jet1 and Jet2 exposed to incoming laminar boundary layer at various streamwise locations, x/D = 20, 33, and 53 for different actuation conditions: (a) Vexc = 20 V, (b) Vexc = 30 V, (c) Vexc = 55 V, (d) Vexc = 30 V (fAM = 10 Hz), and (e) Vexc = 30 V (fAM = 50 Hz). The hollow symbol represents the unexcited case.

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Fig. 3

Nondimensional mean velocity (u/Uavg) profiles behind Jet1 and Jet2 exposed to incoming laminar boundary layer at various streamwise locations, x/D = 20, 33, and 53 for different actuation conditions: (a) Vexc = 20 V, (b) Vexc = 30 V, (c) Vexc = 55 V, (d) Vexc = 30 V (fAM = 10 Hz), and (e) Vexc = 30 V (fAM = 50 Hz). The hollow symbol represents the unexcited case.

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Fig. 2

Heat transfer coefficient contours and spanwise-averaged heat transfer coefficient distribution in streamwise direction (x/D) for a double orifice synthetic jet behind a surface-mounted rib in a laminar approaching boundary layer for different actuation conditions. The smooth channel heat transfer coefficient distribution has been shown as dotted line.

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