Effects of Channel Hydraulic Diameters and Flow Ratios of Two‐Phase Flow in Y‐Junction Microchannels

Khan, Wasim; Chandra, Abhishek Kumar; Sachan, Sadhana; Alam, M. Siraj

doi:10.1002/ceat.202100461

Cited by 2 publications

References 18 publications

(24 reference statements)

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A review of frictional pressure drop characteristics of single phase microchannels having different shapes of cross sections

Khatoon

Khan

Shabih-Ul-Hasan

et al. 2023

Chemical Product and Process Modeling

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This paper theoretically studied pressure drop variation in microchannels having different cross sections (circular, rectangular, square, trapezoidal, triangular, elliptical, parallel plate, co-centric circles, hexagonal, wavy, smoothed or rounded corners cross sections, and rhombus) for single phase Newtonian fluid (gas and liquid) flow. Based on 41 years (approximately) prior literature (1981–till now), 249 articles were studied and number of correlations of pressure drop calculation in microchannels with or without friction factor equation for four cross sections i.e., rectangular, square, circular, trapezoidal, wavy and triangular is collected and also mentioned their limitations at one place. Other than these four cross sections, there is very few experimental/numerical works was present in the literature. A comparable study was performed for laminar as well as turbulent friction factor to calculate the pressure drop with the help of classical theory for gas and liquid flow in microchannels with circular and rectangular cross sections. Results show wonderful outcomes i.e., correlations of laminar pressure drop study can be extendable for transition and turbulent regime in both types (circular and rectangular) of cross sections of microchannels. In different types of flow regime, it is suggested that for each type of cross section (circular and rectangular) we can go for single correlation for gas/liquid system. It is also investigated that the macro channels pressure drop equations can be used for microchannels up to the certain values of Reynolds number. Basically, this paper provides all possible equations of friction factor related to the microchannels that helps to calculate the pressure drop, is collected at one platform also compared their deviation with conventional channels.

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A review of frictional pressure drop characteristics of single phase microchannels having different shapes of cross sections

Khatoon

Khan

Shabih-Ul-Hasan

et al. 2023

Chemical Product and Process Modeling

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Numerical study on mixing of two fluids in a Y-junction microchannel with and without obstructions

Khan

Chandra

Kishor³

et al. 2023

Preprint

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A two dimensional simulation study of liquid–liquid (water and cyclohexane) two phase flow in Y-junction microchannels with and without obstructions has been studied numerically using volume of fluid method (VOF). The Y-junction angle of inclination between inlets of the two phases was varied in three equal steps. Various types of flow pattern were visualized for different concentrations of liquids, and velocity fields were also checked to quantify mixing efficiency. On the basis of mixing efficiency and mixing length an optimal angle was obtained. A comparison of mixing efficiencies with and without obstructions in mixing zone clearly indicates the usefulness of microchannel with obstructions. The simulated results obtained were also compared and validated with existing theoretical and experimental results. As angle of inclination is one of the key parameter influencing the mixing of components in microchannels apart from velocities of the two phases, so two approaches were used to predict flow behavior and mixing efficiency, firstly by varying the angle of inclination in three steps (60°, 90° and 120) keeping liquid velocities constant and secondly by varying the velocity of liquids (from 0.025 ms− 1 to 0.5 ms− 1) keeping angle of inclination constant. Finally, 120° was observed as the optimal angle of inclination for mixing of liquids. In addition, heat effects on mixing of liquids in microchannel wall temperature ranges 300 to 350 K were also studied and discussed. Pressure of the Y-junction at different angles of two inlets with different capillary number (Ca) as well as different Reynolds no (Re) was also analyzed to investigate flow patterns mechanism.

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Effects of Channel Hydraulic Diameters and Flow Ratios of Two‐Phase Flow in Y‐Junction Microchannels

Cited by 2 publications

References 18 publications

A review of frictional pressure drop characteristics of single phase microchannels having different shapes of cross sections

A review of frictional pressure drop characteristics of single phase microchannels having different shapes of cross sections

Numerical study on mixing of two fluids in a Y-junction microchannel with and without obstructions

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