Study of transient heat transfer and synchronized flow visualizations during sub-cooled flow boiling in a small aspect ratio microchannel

Jagirdar, Mrinal; Lee, Poh Seng

doi:10.1016/j.ijmultiphaseflow.2016.04.004

Cited by 13 publications

(4 citation statements)

References 20 publications

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“…Fig. 9 shows the comparison of the modeled local transient heat transfer coefficient with the experimental data of Jagirdar and Lee [5] for water, under different operating conditions. The modeled heat transfer coefficient is in reasonably good agreement with the experimental data, both in trend and magnitude.…”

Section: Resultsmentioning

confidence: 99%

“…Jagirdar and Lee [5] investigated the transient local heat transfer coefficient at different locations in a single rectangular channel with dimensions as 0.42×2.54×25.4 mm during subcooled flow boiling. The synchronized flow visualization showed that the variation in the heat transfer coefficient is due to the passing of liquid, vapour bubble (surrounded by liquid) and dry-out, cyclically over the given location.…”

Section: Transient Variationmentioning

confidence: 99%

“…shows the comparison of the modeled local transient heat transfer coefficient with the experimental data of Jagirdar and Lee[5] for water, under different operating conditions. The modeled heat transfer coefficient is in reasonably good agreement with the experimental data, both in trend and magnitude.The local heat transfer coefficient variation from A to B is due to the acceleration of the liquid slug caused by the bubble growth on the upstream side.…”

mentioning

confidence: 99%

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Modeling of pressure drop and heat transfer for flow boiling in a mini/micro-channel of rectangular cross-section

Jain

Jayaramu

Gedupudi

2019

International Journal of Heat and Mass Transfer

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In the present study, a 1-dimensional model is proposed to estimate the pressure drop and heat transfer coefficient for flow boiling in a rectangular microchannel. The present work takes into account the pressure fluctuations caused due to the confined bubble growth and the effect of pressure fluctuations on the heat transfer characteristics. The heat transfer model considers five zones, namely, liquid slug, partially confined bubble, fully confined (elongated) bubble, partial dryout and full dry-out. The model incorporates the thinning of liquid film due to shear stress at liquid-vapour interface in addition to evaporation. The transient fluctuations in pressure and heat transfer coefficient, along with the time-averaged ones, are verified with the experimental data available in the literature. Heat transfer characteristics with flow reversal caused by inlet compressibility are also presented.

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Section: Resultsmentioning

confidence: 99%

Section: Transient Variationmentioning

confidence: 99%

mentioning

confidence: 99%

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Modeling of pressure drop and heat transfer for flow boiling in a mini/micro-channel of rectangular cross-section

Jain

Jayaramu

Gedupudi

2019

International Journal of Heat and Mass Transfer

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show abstract

“…A model for the estimation of the heat transfer coefficient is consequently established. In this regard, Jagirdar and Lee [31] investigated the transient local heat transfer coefficient at different locations in a single mini rectangular channel during subcooled flow boiling. They observed variation of the heat transfer coefficient over a given location due to passing of different flow patterns.…”

Section: Introductionmentioning

confidence: 99%

Local Heat Transfer Analysis in a Single Microchannel with Boiling DI-Water and Correlations with Impedance Local Sensors

et al. 2020

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Determination of local heat transfer coefficient at the interface of channel wall and fluid was the main goal of this experimental study in microchannel flow boiling domain. Flow boiling heat transfer to DI-water in a single microchannel with a rectangular cross section was experimentally investigated. The rectangular cross section dimensions of the experimented microchannel were 1050 μm × 500 μm and 1500 μm × 500 μm. Experiments under conditions of boiling were performed in a test setup, which allows the optical and local impedance measurements of the fluids by mass fluxes of 22.1 kg·m−2·s−1 to 118.8 kg·m−2·s−1 and heat fluxes in the range of 14.7 kW·m−2 to 116.54 kW·m−2. The effect of the mass flux, heat flux, and flow pattern on flow boiling local heat transfer coefficient and pressure drop were investigated. Experimental data compared to existing correlations indicated no single correlation of good predictive value. This was concluded to be the case due to the instability of flow conditions on one hand and the variation of the flow regimes over the experimental conditions on the other hand. The results from the local impedance measurements in correlation to the optical measurements shows the flow regime variation at the experimental conditions. From these measurements, useful parameters for use in models on boiling like the 3-zone model were shown. It was shown that the sensing method can shed a precise light on unknown features locally in slug flow such as residence time of each phases, bubble frequency, and duty cycle.

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A study on thermohydraulic characteristics of fluid flow through microchannels

Sharma

Jilte

et al. 2019

J Therm Anal Calorim

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Study of transient heat transfer and synchronized flow visualizations during sub-cooled flow boiling in a small aspect ratio microchannel

Cited by 13 publications

References 20 publications

Modeling of pressure drop and heat transfer for flow boiling in a mini/micro-channel of rectangular cross-section

Modeling of pressure drop and heat transfer for flow boiling in a mini/micro-channel of rectangular cross-section

Local Heat Transfer Analysis in a Single Microchannel with Boiling DI-Water and Correlations with Impedance Local Sensors

A study on thermohydraulic characteristics of fluid flow through microchannels

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