The conjugate heat transfer of the partially heated microchannels

Lelea, Dorin

doi:10.1007/s00231-006-0228-1

Cited by 36 publications

(13 citation statements)

References 13 publications

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“…They observed significant effects of coolant flow direction on heat transfer performance and obtained a better temperature uniformity with the parallel flow arrangement compared to the counterflow arrangement. In the conjugate heat transfer study of Lelea [20] on partially heated microtubes made of copper, silicon and stainless steel, local Nusselt number distribution complied with the theory for the non-axial conduction case, which was observed at intermediate and high Reynolds numbers (Re > 200). The author also emphasized on the effect of the wall thickness and material on the heat transfer.…”

Section: Introductionsupporting

confidence: 61%

“…Biot number (¼h HF t/k solid ), which is a function of the substrate thickness (t) and represents the ratio of conduction in the solid to the convection, and the dimensionless conductivity k * (¼k solid /k Copper ) are employed as dimensionless numbers to develop a general correlation. This approach is based on the conjugate heat transfer analysis performed in the literature [17,20,23].…”

Section: New Nusselt Number Correlationmentioning

confidence: 99%

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Effect of substrate thickness and material on heat transfer in microchannel heat sinks

Koşar

2010

International Journal of Thermal Sciences

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Section: Introductionsupporting

confidence: 61%

Section: New Nusselt Number Correlationmentioning

confidence: 99%

Effect of substrate thickness and material on heat transfer in microchannel heat sinks

Koşar

2010

International Journal of Thermal Sciences

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“…Lelea [30] numerically studied this problem by considering constant heat flux on the outer surface along the heated portion of the microtube and found that axial wall conduction is negligible when microtube wall material conductivity is comparatively low. Their observation was based on numerical analysis on three microtube wall materials (made of steel, silicon, and copper, respectively).…”

Section: Axial Wall Conduction In Partially Heated Microtubesmentioning

confidence: 99%

Axial Back Conduction through Channel Walls During Internal Convective Microchannel Flows

Khandekar

Moharana

2015

Springer Tracts in Mechanical Engineering

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Recent developments during the last decade in the field of manufacturing and development of many high-power mini-/micro-devices led to increased interest in microfluidic devices involving heat transfer. Since the pioneering work by Tuckerman and Pease (IEEE Electron Device Lett 2:126-129, 1981) on the use of microchannels for high heat flux removal, certainly a lot of developments has been witnessed through ever-increasing analytical, experimental, and highly sophisticated numerical studies by many researchers across the globe. In spite of this progress, many fundamental understandings of flow and heat transfer phenomena in mini-/microchannel systems are still obscure. One such phenomenon is the flow of heat in the solid wall of microchannel systems by means of conduction normally in a direction opposite to that of internal convective mini-/microchannel flow of fluid, called "axial wall conduction" or "axial back conduction." Axial back conduction is not a new phenomenon, rather mostly neglected unintentionally because of its convincingly smaller influence on heat transfer in conventional-size channels. As the hydraulic diameter of a channel decreases, the coupling between the substrate and bulk fluid temperatures becomes significant because of the relative size of the fluid to the solid wall. Unlike in conventional-size channels, negligence of axial back conduction along the solid walls of micro heat exchangers frequently leads to erroneous conclusions and inconsistencies in the interpretation of transport data. Thus, it is important to explicitly identify the thermofluidic parameters of interest which lead to a distortion in the boundary conditions and thus the true estimation of species transfer coefficients. In this chapter, we focus our attention on the axial back conduction in the solid substrate/channel wall as against the axial back conduction in the liquid flow domain; thus, a detailed review of the state-of-the-art on axial back conduction in both conventional as well as mini-/microchannel systems is presented.

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“…The solution procedure is based on the method used in [25] for microtubes and on the Finite Volume Method described in [26]. First, the parabolic flow field condition is considered and the velocity field is solved.…”

Section: Numerical Detailsmentioning

confidence: 99%

The conjugate heat transfer of the partially heated microchannels

Cited by 36 publications

References 13 publications

Effect of substrate thickness and material on heat transfer in microchannel heat sinks

Effect of substrate thickness and material on heat transfer in microchannel heat sinks

Axial Back Conduction through Channel Walls During Internal Convective Microchannel Flows

The performance evaluation of Al2O3/water nanofluid flow and heat transfer in microchannel heat sink

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