Low Reynolds number laminar channel flow is used in various heat/mass transfer applications such as cooling and mixing. A low Reynolds number implies a low intensity of heat/mass transfer processes since they rely only on the gradient diffusion. To enhance these processes, an active flow control by means of synthetic (zero-net-mass-flux) jets is proposed. The present study is experimental, in which a Reynolds number range of 200–500 is investigated. Measurement has been performed mainly in air as the working fluid by means of hot-wire anemometry and the naphthalene sublimation technique. Particle image velocimetry (PIV) experiments in water are also discussed. The experiments have been performed in macroscale at the channel cross sections and in air and water, respectively. The results show that the low Reynolds number channel flow can be influenced by an array of synthetic jets. The effect of synthetic jets on the heat transfer enhancement is quantified. The stagnation Nusselt number is enhanced by 10–30 times in comparison with the nonactuated channel flow. The results indicate that the present arrangement can be a useful tool for heat transfer enhancement in various applications, e.g., cooling and mixing.
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e-mail: tr@it.cas.cz
e-mail: petra.dancova@tul.cz
e-mail: kordik@it.cas.cz
e-mail: tomas.vit@tul.cz
e-mail: pavelka@it.cas.cz
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December 2010
Research Papers
Heat and Mass Transfer Caused by a Laminar Channel Flow Equipped With a Synthetic Jet Array
Zdeněk Trávníček,
e-mail: tr@it.cas.cz
Zdeněk Trávníček
Institute of Thermomechanics AS CR, v. v. i.
, Dolejškova 5, Prague 182 00, Czech Republic
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Petra Dančová,
e-mail: petra.dancova@tul.cz
Petra Dančová
Technical University of Liberec
, Studentská 2, Liberec 461 17, Czech Republic; Institute of Thermomechanics AS CR, v. v. i.
, Dolejškova 5, Prague 182 00, Czech Republic
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Jozef Kordík,
e-mail: kordik@it.cas.cz
Jozef Kordík
Institute of Thermomechanics AS CR, v. v. i.
, Dolejškova 5, Prague 182 00, Czech Republic
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Tomáš Vít,
e-mail: tomas.vit@tul.cz
Tomáš Vít
Technical University of Liberec
, Studentská 2, Liberec 461 17, Czech Republic; Institute of Thermomechanics AS CR, v. v. i.
, Dolejškova 5, Prague 182 00, Czech Republic
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Miroslav Pavelka
e-mail: pavelka@it.cas.cz
Miroslav Pavelka
Institute of Thermomechanics AS CR, v. v. i.
, Dolejškova 5, Prague 182 00, Czech Republic
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Zdeněk Trávníček
Institute of Thermomechanics AS CR, v. v. i.
, Dolejškova 5, Prague 182 00, Czech Republice-mail: tr@it.cas.cz
Petra Dančová
Technical University of Liberec
, Studentská 2, Liberec 461 17, Czech Republic; Institute of Thermomechanics AS CR, v. v. i.
, Dolejškova 5, Prague 182 00, Czech Republice-mail: petra.dancova@tul.cz
Jozef Kordík
Institute of Thermomechanics AS CR, v. v. i.
, Dolejškova 5, Prague 182 00, Czech Republice-mail: kordik@it.cas.cz
Tomáš Vít
Technical University of Liberec
, Studentská 2, Liberec 461 17, Czech Republic; Institute of Thermomechanics AS CR, v. v. i.
, Dolejškova 5, Prague 182 00, Czech Republice-mail: tomas.vit@tul.cz
Miroslav Pavelka
Institute of Thermomechanics AS CR, v. v. i.
, Dolejškova 5, Prague 182 00, Czech Republice-mail: pavelka@it.cas.cz
J. Thermal Sci. Eng. Appl. Dec 2010, 2(4): 041006 (8 pages)
Published Online: February 8, 2011
Article history
Received:
September 14, 2010
Revised:
January 2, 2011
Published:
February 8, 2011
Citation
Trávníček, Z., Dančová, P., Kordík, J., Vít, T., and Pavelka, M. (February 8, 2011). "Heat and Mass Transfer Caused by a Laminar Channel Flow Equipped With a Synthetic Jet Array." ASME. J. Thermal Sci. Eng. Appl. December 2010; 2(4): 041006. https://doi.org/10.1115/1.4003428
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