Experimental study on forced convective heat transfer characteristics in quartz microtube

In this paper flow boiling phenomenological differences between micro and macroscale channels are discussed. Analyses of flow pattern results are performed in order to identify the main differences between micro-and macro-scale phenomena. Based on these analyses important flow pattern differences between micro and macro-scale behaviors were identified, and new phenomenological transition criteria based on flow patterns are presented. These criteria are based on the existence of stratified flow and on the degree of uniformity of the liquid film along the tube perimeter during annular flow.

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“…Effects like axial heat conduction within the tube wall, heat losses and entrance effects were not appropriately taken into account [3,4].…”

Section: Introductionmentioning

confidence: 99%

Flow Boiling Phenomenological Differences Between Micro- and Macroscale Channels

Tibiriçá

Ribatski

2015

Heat Transfer Engineering

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“…A large number of experimental and numerical studies focused on the flow and heat transfer behavior in a microtube have been reported by many researchers; Liu et al [12] investigated experimentally the forced convective heat transfer characteristics in quartz microtubes with inner diameters of 242, 315 and 520 μm. The deionized water was used as the working fluid.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigation of heat transfer enhancement in a microtube using nanofluids

Salman¹,

Mohammed²,

Kherbeet³

2014

International Communications in Heat and Mass Transfer

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“…Liu et al [13] investigated forced convection heat transfer to deionized water through quartz microtubes and found that as Reynolds number increased beyond 1500, the Nusselt number was higher than that predicted by the classical theory.…”

Section: Literature Reviewmentioning

confidence: 99%

“…The Gnielinski equation was modified for the entry region effects as proposed by Dittus-Boelter [1] and Latzko [25], and the friction factor was calculated using the equation suggested by Haaland [26]. For short tubes, Latzko [25] recommended the following approximate relations for the average heat transfer coefficient in the entry region: (13) and N u e…”

Section: Comparison With Available Correlationsmentioning

confidence: 99%

Experimental Study of Forced Convection Heat Transfer of Water in a Short Microduct at a Turbulent Reynolds Number

Syed

Mukherjee

2012

Heat Transfer Engineering

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The present study deals with experimental investigation of cooling of machining tools, by water flowing through a microduct at the tip of the tool. The average diameter of the microduct is 200 µm and the flow takes place at a turbulent Reynolds number. The outer wall temperature of the tool and the temperature of water at inlet and exit have been measured. The convective heat transfer coefficient is calculated at different wall temperatures and mass flux. The experimental results show that the average Nusselt numbers in the short microduct are higher than those predicted by conventional correlations for large-diameter ducts. This enhancement may be attributed to the micro size of the duct, entry effects, transition from laminar to turbulent flow at the microduct entrance, suspended microscopic particles in coolant water, and Prandtl number estimation based on the mean fluid temperature. A correlation has been proposed to compute convective heat transfer during turbulent flow through a short microduct of a particular geometry for a range of Reynolds and Prandtl numbers.

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Experimental study on forced convective heat transfer characteristics in quartz microtube

Cited by 30 publications

References 17 publications

Flow Boiling Phenomenological Differences Between Micro- and Macroscale Channels

Flow Boiling Phenomenological Differences Between Micro- and Macroscale Channels

Numerical and experimental investigation of heat transfer enhancement in a microtube using nanofluids

Experimental Study of Forced Convection Heat Transfer of Water in a Short Microduct at a Turbulent Reynolds Number

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