A new correlation and the review of two-phase flow pressure change across sudden expansion in small channels

Wang, Chi-Chuan; Tseng, Chyuan-Yow; Chen, Ing Youn

doi:10.1016/j.ijheatmasstransfer.2010.05.057

Cited by 20 publications

(20 citation statements)

References 24 publications

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“…Later experimental [5][6][7][8] and numerical [9,10] studies of separated isothermal bubbly flows were continued. A theoretical and experimental study of upward bubbly flow in a pipe with sudden expansion [5] was carried out on.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Numerical Study of the Flow and Heat Transfer in a Bubbly Turbulent Flow in a Pipe with Sudden Expansion

2019

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The flow patterns and heat transfer of a downstream bubbly flow in a sudden pipe expansion are experimentally and numerically studied. Measurements of the bubble size were performed using shadow photography. Fluid phase velocities were measured using a PIV system. The numerical model was employed the Eulerian approach. The set of RANS equations was used for modelling two-phase bubbly flows. The turbulence of the carrier liquid phase was predicted using the Reynolds stress model. The peak of axial and radial fluctuations of the carrier fluid (liquid) velocity in the bubbly flow is observed in the shear layer. The addition of air bubbles resulted in a significant increase in the heat transfer rate (up to 300%). The main enhancement in heat transfer is observed after the point of flow reattachment.Energies 2019, 12, 2735 2 of 18 regime. Gas concentration increased immediately after the cross-section of the flow separation. Measurements by [7] were performed in an upward, vertical flow of a liquid (water) and CO 2 bubbles. The distribution of the mean carrier fluid velocity was strongly dependent on the bubbles' diameter. A review of the literature for two-phase flow in sudden expansions and contractions was performed in [8]. Wang et al. [8] have found that none of the existing eight correlations can accurately predict the experimental database. Most of these correlations greatly overpredicted the results for mini test sections. Some of the correlations also underpredicted the data for large test sections.There are only a few papers that consider the numerical modeling of isothermal bubbly flows in a pipe with sudden expansion [9,10]. Krepper et al. [9] presented a mathematical model for polydisperse flow in a vertical pipe with sudden expansion. The numerical predictions for bubbly pipe flow with an obstacle demonstrated very difficult nature of such flows [9]. The Eulerian model was developed to simulate bubbly flows in a pipe with sudden expansion in [10]. Predictions were carried out using the CFD commercial package STAR-CCM+. The developed model was validated against measurements of Bel Fdhila [11]. The eddy-viscosity k−ε model showed poor reproduction of the bubbly flow structure because it disregarded much of the information on fluid flow turbulence. The Second-Moment Closure and LES methods captured the main characteristic turbulent length-scales responsible for the diffusion of the bubble gas phase, and moreover, these methods predicted the flow patterns and bubble distributions across the pipe section [10].Recently published numerical works [12,13] investigated heat transfer in bubbly flows without an abrupt pipe or channel expansion. These studies showed the significant influence of bubble diameter and gas volumetric flow rate ratios on the flow patterns and heat transfer. Heat transfer in bubbly flow increased up to three times that of one-phase fluid flow. The liquid turbulence was modeled using an isotropic k−ε model [12]. The DNS of bubbly flow with heat transfer was performed [13]. The numerical [14...

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Section: Introductionmentioning

confidence: 99%

“…The distribution of the mean carrier fluid velocity was strongly dependent on the bubbles' diameter. A review of the literature for two-phase flow in sudden expansions and contractions was performed in [8]. Wang et al [8] have found that none of the existing eight correlations can accurately predict the experimental database.…”

mentioning

confidence: 99%

Experimental and Numerical Study of the Flow and Heat Transfer in a Bubbly Turbulent Flow in a Pipe with Sudden Expansion

2019

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“…As also reported by Ribatski et al (2006) and Revellin et al (2006), the methods on the basis of homogeneous flow model were able to tentatively apply for micro-channels under a certain range of experimental condition. M oreover, the homogeneous flow model was adopted by Chen et al (2009) and Wang et al (2010) to predict the pressure drop for two-phase flow through abrupt area change.…”

Section: Two-phas E Press Ure Dropmentioning

confidence: 99%

“…The correlation for two-phase pressure change due to sudden expansion in small flow passages was proposed by Wang et al (2010). With 282 data collected from the literature, their prediction method based on the modified homogeneous model is given by the following equation.…”

Section: Two-phas E Press Ure Dropmentioning

confidence: 99%

A Critical Review of Recent Investigations on Two-Phase Pressure Drop in Flow Boiling Micro-Channels

Saisorn¹

2012

Frontiers in Heat and Mass Transfer

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“…The flow of two-phase mixtures across sudden expansions and contractions is commonly seen among piping connections as well as relevant to many applications such as chemical reactors, power generation units, oil wells and petrochemical plants [1]. In particular, the small and narrow channels are widely adopted in compact heat exchangers [2].…”

Section: Introductionmentioning

confidence: 99%

Single Phase and Two Phase Pressure Drops Across Sudden Contraction in Horizontal Rectangular Minichannel

Santoso¹,

Kawahara²,

Goto³

et al. 2015

Third International Conference on Advances in Mechanical, Aeronautical and Production Techniques - MAPT 2015

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This paper presents experimental investigations on the effects of liquid properties on pressure drop for both single-phase and two-phase flows through sudden contraction in horizontal rectangular minichannel. In order to know the effects, water and viscoelastic liquid, namely 0.1 wt% polyacrylamide (PAM) aqueous solution are selected as the working liquid, while air as the working gas. Liquid single-phase and air-liquid twophase flow experiments were conducted at room temperature using a horizontal rectangular mini-channel with a sudden contraction. The cross-sectional dimensions of the channel with the height (H), the width (W) and the hydraulic diameter (D H) for the narrow channel are 2.79 mm, 3.09 mm and 2.94 mm, while those for the wide channel are 2.95 mm, 5.98 mm and 3.95 mm. The local pressure upstream and downstream from the contraction were measured with calibrated pressure transducer to determine the pressure drop due to the contraction. As an analysis, the resulting data on the pressure drop at the contraction were compared with several correlations in literature. Results of such experiment and analysis are reported in the present paper.

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A new correlation and the review of two-phase flow pressure change across sudden expansion in small channels

Cited by 20 publications

References 24 publications

Experimental and Numerical Study of the Flow and Heat Transfer in a Bubbly Turbulent Flow in a Pipe with Sudden Expansion

Experimental and Numerical Study of the Flow and Heat Transfer in a Bubbly Turbulent Flow in a Pipe with Sudden Expansion

A Critical Review of Recent Investigations on Two-Phase Pressure Drop in Flow Boiling Micro-Channels

Single Phase and Two Phase Pressure Drops Across Sudden Contraction in Horizontal Rectangular Minichannel

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