A Theoretical Model for Axial Heat Conduction Effects During Single-Phase Flow in Microchannels

Lin, Tingyu; Kandlikar, Satish G.

doi:10.1115/1.4004936

Cited by 41 publications

(31 citation statements)

References 27 publications

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“…They found that the axial conduction effects in the wall are severe for gas flows through any tube material. Lin and Kandlikar [33] also found that axial conduction effects in the wall are negligible for water flowing through stainless steel microtubes, while for higher conductivity materials, it is not negligible even for water.…”

Section: Axial Back Conduction In Micro-sized Channelsmentioning

confidence: 95%

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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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Section: Axial Back Conduction In Micro-sized Channelsmentioning

confidence: 95%

“…Lin and Kandlikar [33] have recently developed a theoretical model to analyze the effect of axial conduction on heat transfer during single-phase flow in microchannels. This model is based on the assumption that flow is thermally and hydrodynamically fully developed.…”

Section: Axial Back Conduction In Micro-sized Channelsmentioning

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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“…They also derived a set of equations, which were numerically solved to investigate these effects. Lin and Kandlikar (2012a) considered the axial conduction effects to cause an increased heat transfer to the fluid near the entrance region, leading to a higher heat transfer rate and a higher fluid temperature at any section in the heat exchanger. They derived the following equation to determine the Nusselt number in the presence of axial conduction effects.…”

Section: Axial Conduction Effectsmentioning

confidence: 99%

Single-Phase Liquid Flow in Minichannels and Microchannels

Kandlikar

2014

Heat Transfer and Fluid Flow in Minichannels and Microchannels

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“…Lin and Kandlikar [15] developed a model to analyze the effect of LHC on heat transfer during single-phase flow in microchannels. The results showed for any tube material the effect of LHC in the wall was severe for gas flow and for water the effect of LHC in the wall was not negligible only for high conductivity channel material or thick channel wall.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study of Small-Scale Longitudinal Heat Conduction in Plate Heat Exchangers

Borjigin

Zeng

et al. 2018

Energies

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Abstract:Longitudinal heat conduction has a significant effect on the heat transfer performance of plate heat exchangers, but longitudinal heat conduction is usually neglected in numerical studies and the thermal design of a heat exchanger. In this paper, heat transfer models with and without longitudinal heat conduction are proposed to analyze the effect of small-scale longitudinal heat conduction in a plate heat exchanger. The performance of small-scale longitudinal heat conduction is illustrated by temperature and heat flux contours in the heat transfer models with and without longitudinal heat conduction. The results show that small-scale longitudinal heat conduction occurs in the plate and a more uniform temperature profile of the plate is obtained due to small-scale longitudinal heat conduction. In balanced flow, the contributions of longitudinal heat conduction for counter-flow, cross-flow and parallel-flow plate heat exchangers are −3.15%, −0.09% and 0, respectively, whereas, for the respective unbalanced flows they are evaluated to be −1.73%, 0.53% and 0.05%, respectively. Moreover, it is observed that small-scale longitudinal heat conduction in plates is influenced by the thermal conductivity of the plate. The higher the thermal conductivity, the larger is the reduction of thermal performance. The contribution of longitudinal heat conduction varies from −0.54% to −4.01%.

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A Theoretical Model for Axial Heat Conduction Effects During Single-Phase Flow in Microchannels

Cited by 41 publications

References 27 publications

Axial Back Conduction through Channel Walls During Internal Convective Microchannel Flows

Axial Back Conduction through Channel Walls During Internal Convective Microchannel Flows

Single-Phase Liquid Flow in Minichannels and Microchannels

A Numerical Study of Small-Scale Longitudinal Heat Conduction in Plate Heat Exchangers

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