The effect of axial conduction on heat transfer in a liquid microchannel flow

Cole, Kevin D.; Çetin, Barbaros

doi:10.1016/j.ijheatmasstransfer.2011.02.007

Cited by 45 publications

(26 citation statements)

References 18 publications

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“…In such heat transfer devices, not only the fluid properties but also the properties of the wall such as its thermal conductivity and thickness also influence the heat flux transported by the fluid and hence the problem becomes a conjugate heat transfer problem. Further, if the wall thickness is equal to or larger than the hydraulic diameter, the effect of heat conduction in the wall on the heat flux transported in the fluid cannot be neglected, and hence the level of conjugation becomes predominant [14]. Therefore, in the present investigation, as we are considering the channels with small hydraulic diameters, the effect of conjugation has to be considered.…”

Section: Introductionmentioning

confidence: 99%

Study of Conjugate Heat Transfer in Electromagnetic Liquid Metal Dream Pipe

Puvaneswari

Karthikeyan

2017

Archive of Mechanical Engineering

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The combined effect of conjugation, external magnetic field and oscillation on the enhancement of heat transfer in the laminar flow of liquid metals between parallel plate channels is analyzed. In order to make our results useful to the design engineers, we have considered here only the wall materials that are widely employed in liquid metal heat exchangers. Indeed, all the results obtained through this mathematical investigation are in excellent agreement with the available experimental results. The effective thermal diffusivity κ e is increased by 3 · 10 6 times due to oscillation and that the heat flux as high as 1.5 · 10 10 (W/m 2 ) can be achieved. Based on our investigation, we have recommended the best choice of liquid metal heat carrier, wall material and its optimum thickness along with the optimum value of the frequency to maximize the heat transfer rate. At the optimum frequency, by choosing a wall of high thermal conductivity and optimum thickness, an increase of 19.98% in κ e can be achieved. Our results are directly relevant to the design of a heat transfer device known as electromagnetic dream pipe which is a very recent development.

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Section: Introductionmentioning

confidence: 99%

Study of Conjugate Heat Transfer in Electromagnetic Liquid Metal Dream Pipe

Puvaneswari

Karthikeyan

2017

Archive of Mechanical Engineering

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“…In each of these layers, application of the Fourier transform removes the x coordinate, leaving heat conduction through layers along the y direction. This method has been previously applied to laminar flow in liquids [19], and the present work is an extension of the method to slip flow in gases.…”

Section: B Multiple-layer Solutionmentioning

confidence: 99%

“…Here, the Green's function G i for the Fourier-space response of a layer with slug flow is available in the form of complex-valued exponentials [19] and is given in the Appendix. In the preceding temperature expressions, all of the interface heat fluxes are initially unknown.…”

Section: B Multiple-layer Solutionmentioning

confidence: 99%

“…In microchannel flow, when the Peclet number is small, the heat conducted through the channel wall (which moves in all directions) dominates over the heat conducted by the fluid (which is in the direction of fluid velocity). The wall conduction prewarms the fluid upstream of the heater, which decreases the temperature difference between the fluid and the wall [19]. As the Peclet number increases, convection has more influence on the heat transfer so that the temperature difference between the fluid and the wall increases, which decreases the Nusselt number.…”

Section: B Nusselt Number On Heatermentioning

confidence: 99%

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Microchannel Heat Transfer with Slip Flow and Wall Effects

Cole

Çetin

Brettmann

2014

Journal of Thermophysics and Heat Transfer

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Analysis is presented for conjugate heat transfer in a parallel-plate microchannel. Axial conduction in the fluid and in the adjacent wall is included. The fluid is a constant property gas with a slip-flow velocity distribution. The microchannel is heated by a small region on the channel wall. The analytic solution is given in the form of integrals by the method of Green's functions. Quadrature is used to obtain numerical results for the temperature and heat transfer coefficient on the heated region for various Peclet number, Knudsen number, and wall materials. A region downstream of the heater is also explored. These results have application in the optimal design of small-scale heat transfer devices for biomedical applications, electronic cooling, and advanced fuel cells.

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“…The effect of the heat conduction in the fluid on the heat transfer has been studied by Jeong (2006), Cetin et al (2008Cetin et al ( & 2009, and Cole and Çetin (2011) for different boundary conditions. This type of heat conduction is not considered in the current study, as the calculated Pe number of the motor oil is large.…”

Section: Axial Heat Conduction In Fluidmentioning

confidence: 99%