A parametric study on phase change heat transfer due to Taylor-Bubble coalescence in a square minichannel

Pattamatta, Arvind; Freystein, Martin; Stephan, Peter

doi:10.1016/j.ijheatmasstransfer.2014.04.017

Cited by 17 publications

(6 citation statements)

References 27 publications

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“…Precise experimental measurements of the flow rate in the continuous liquid phase and volume of the bubble are used as inputs to numerically simulate the flow. While ANSYS Fluent has been extensively utilised for the simulation of two-phase flows in narrow channels (Gupta et al 2009;Mehdizadeh et al 2011;Gregorc and Zun 2013;Qian and Lawal 2006;Talimi et al 2012), the literature concerning the use of OpenFOAM is still limited (Hoang et al 2013;Pattamatta et al 2014;Ghaini et al 2011). Hence, simulations were presently run by employing both the solvers with the aim of comparing their performances and providing further validation to OpenFOAM.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of isolated confined air bubbles in liquid flows through circular microchannels: an experimental and numerical study

Khodaparast

Magnini

Borhani

et al. 2015

Microfluid Nanofluid

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ESI OpenFOAM v. 2.1.1. The present approach not only results in valuable findings on the underlying physics involved in the problem of interest but also allows us to directly compare and validate results that are currently obtained by the experimental and computational methods. It is believed that similar methodology can be employed to rigorously investigate more complex two-phase flow regimes in micro-geometries.

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Section: Introductionmentioning

confidence: 99%

Dynamics of isolated confined air bubbles in liquid flows through circular microchannels: an experimental and numerical study

Khodaparast

Magnini

Borhani

et al. 2015

Microfluid Nanofluid

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“…Transient wall temperature measurements using microheater arrays [8][9][10][11][12][13][14], infrared cameras [15][16][17][18][19][20][21], and microsensor arrays [22][23][24][25][26][27][28][29] have been used to reveal the intricate physics that dictate bubble nucleation and departure. More recently, researchers have also made inroads in exploring transient dynamics in flow boiling [30][31][32]. Building on the microfabrication, experimental, and numerical techniques discussed in our previous works [33][34][35][36] reported here.…”

Section: Introductionmentioning

confidence: 89%

Spatiotemporally resolved heat transfer measurements for flow boiling in microchannels

Rao

Peles

2015

International Journal of Heat and Mass Transfer

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a b s t r a c tSpatiotemporally resolved wall heat transfer measurements can provide valuable insight into the fundamental mechanisms affecting flow boiling in microchannels. Operating at the microscale, necessitates resolving changes in local and instantaneous heat transfer characteristics on the order of 100 lm and 1 kHz, respectively. Straightforward interpretation of transient temperature measurements is often challenging due to the conjugate conduction effects in the substrate, which can dampen the measured and inferred heat transfer quantities. These damping effects are described using a slip coefficient (S), which represents the fraction of the change in the local heat transfer that is registered by a sensor (negligible thermal mass) located on a given substrate. Using S, arguments are presented that the conduction patterns in the substrate are predominantly 1-D (i.e. into the substrate) at suitable spatiotemporal-scales. Building on these fundamental considerations, a numerical procedure is adopted to allow a time varying estimate of the local convective heat flux and heat transfer coefficient from transient temperature measurements. Examples of this framework are showcased with experimental results and discussions for interactions observed during flow boiling of HFE 7000 in a single microchannel (hydraulic diameter = 370 lm). At the relatively low mass flux of 200 kg/m 2 s reported in this work, liquid evaporation was found to dictate the local heat transfer trends. High rates of heat transfer were observed to accompany the growth of bubbles and evaporation of the liquid film under vapor slugs. Local dryout was routinely observed in the bubbly and slug flow regime and found to initially enhance heat transfer (i.e. at the creation and subsequent propagation of the three-phase contact line) and present near-zero heat transfer rates in the dried-out domain.

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“…Channel depth was also identified as a factor for bubble length while mass flux had nearly no effect on bubble geometry. In their numerical study, Pattamatta et al [104] investigated the effects of Reynolds number, wall superheat, bubble size and Capillary number to the growth and coalescence of Taylor-Bubbles in FC72 flow boiling in a square minichannel. Open FOAM CFD (Computational Fluid Dynamics) code with finite volume model was selected as the simulation of the phenomenon and VOF was used to monitor the liquid-gas interface.…”

Section: Bubble Dynamics Inside Minichannels and Microchannelmentioning

confidence: 99%

A Review of Flow Boiling in Mini and Microchannel for Enhanced Geometries

Dalkılıç¹

2018

Journal of Thermal Engineering

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Flow boiling researches in enhanced geometries practiced recently have been summarized in this review. Classical approximations in macroscale flows have not applied to the flows with small hydraulic diameters, so, this subject has been paid attention by the researchers. Application areas of these structures are increasing continuously due to cooling need in small confined spaces. The related studies have been reviewed in a chronological manner and their parameters have been given in a table in order for the researchers to observe the scientific duration regarding the progresses on this subject. Almost all papers on this subject have been produced after 2000, therefore, this subject is considered as an actual one to improve and worth to study in the literature. This study can not only be evaluated as the beginning argument for the researchers involved in flow boiling process in mini and microchannel, but it also consists of new works on the investigated subject.

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A parametric study on phase change heat transfer due to Taylor-Bubble coalescence in a square minichannel

Cited by 17 publications

References 27 publications

Dynamics of isolated confined air bubbles in liquid flows through circular microchannels: an experimental and numerical study

Dynamics of isolated confined air bubbles in liquid flows through circular microchannels: an experimental and numerical study

Spatiotemporally resolved heat transfer measurements for flow boiling in microchannels

A Review of Flow Boiling in Mini and Microchannel for Enhanced Geometries

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