Muhammad Sofwan Mohamad
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Preferred name
Muhammad Sofwan Mohamad
Official Name
Muhammad Sofwan, Mohamad
Alternative Name
Mohamad, M. Sofwan
Mohamad, Muhammad Sofwan
Mohamad, M. S.
Main Affiliation
Scopus Author ID
57212167755
Researcher ID
DGC-8778-2022

Research Output
Now showing 1 - 2 of 2
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Flow fluctuation during flow boiling of binary mixtures in high aspect ratio microchannel

2023 , Arif Widyatama , Mandi Venter , Muhammad Sofwan Mohamad , Jacob Dirker , Daniel Orejon , Khellil Sefiane

Flow boiling performance is affected by several factors, such as channel characteristics and working fluid types. It is found that there is still limited study that discusses the use of binary mixtures combined with high aspect ratio microchannels. The aim of this study is to investigate the flow fluctuation during flow boiling of binary mixtures in rectangular microchannels. Here, a 6 mm width and 0.3 mm depth rectangular channel was utilised, and it represents a hydraulic diameter of 571 μm and an aspect ratio of 20. In the present works, a mass flux of 10 kg m−2 s−1 was used, and the heat flux ranged from 15.2 and 21.0 kW m−2. The image processing technique was applied to track the bubble tail movement. In addition, the thermal camera was utilised to gather the wall temperature distribution of the channel. The preliminary results show that the use of binary mixtures influences the vapour fraction in the channel and the flow fluctuation characteristics. Some differences are observed in terms of wall temperature characteristics. However, the rapid increase of wall temperature is found in the outlet region for high flux cases under all liquid types which suggests the dominance of dry out event.

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Two dimensional numerical simulations of a free-falling liquid gallium droplet in quiescent water

2023-05 , Khellil Sefiane , Muhammad Sofwan Mohamad , Rachid Bennacer

In this study a Lattice Boltzman (LBM) approach is used to simulate free falling drops of liquid metal Gallium into a quiescent water column. The numerical simulations aimed at reproducing experimental observations of the deformations of the Gallium drops and its solutions during the fall. The developed code is first tested against literature for rising bubbles, which showed good agreement. The previously performed experimental investigations allowed the study of a falling liquid Gallium into a column of water to validate the simulations. Parameters such as size of the droplets and viscosity ratios are investigated in the simulations. Deformation mechanisms are explored by studying the instantaneous velocity and pressure field around the drop. A comparison between the numerical simulations and the experimental data showed a good agreement.

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