Research

Collaboration with Dr. Kazi Arafat Rahman

Department of Mechanical Engineering at BUET

EFFECT OF LASER-MATTER INTERACTION DYNAMICS ON ULTRAFAST LASER ABLATION OF COPPER

This work develops a novel TTM–MD framework to accurately predict laser ablation under ultrafast laser irradiation. In this framework, dynamic optical and thermophysical properties are incorporated into the electromagnetic wave equation to model the energy deposition phenomena, instead of relying on the traditional Beer–Lambert law. Moreover, an advection–diffusion equation is employed in the TTM model to predict electron temperature more accurately by accounting for advection effects.

Undergraduate Thesis

Supervisor: Dr. A. K. M. Monjur Morshed, Professor, Department of Mechanical Engineering, BUET

Department of Mechanical Engineering at BUET

A Molecular Dynamics Study of Thermal Conductivity of Single-Layer Graphene under Varying Geometric and Environmental Conditions

This study investigated the effect of defects and sample size on thermal conductivity of single-layer graphene through molecular dynamics simulation using LAMMPS. The main objective of that project was to find a possible way to manage the thermal conductivity of graphene for future nanoelectronics systems

Mentorship of Undergraduate Students

Department of Mechanical Engineering at SUST

The Investigation of Successive Coalescence and Droplet Orientation in Coalescence-Induced Droplet Jumping

This study investigates the successive coalescence-induced jumping in three different orientations. In each orientation, a droplet with an initial velocity approaches two coalescing droplets to simulate the successive nature in reality. The study shows that the successive nature causes a longer period of oscillation and mass redistribution of complex shapes. This increases the time required for the droplet to become stable and spherical. The orientation of droplets, given the same number, turns out to be an important factor, as the energy conversion shows that the velocity of the moving droplet relative to the oscillation of coalescing droplets affects conversion efficiency. This study gives further insight into the dynamics of droplet jumping on a super-hydrophobic surface due to coalescence and the optimization of the process through practical engineering applications

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(b)

(c)

Orientation of the droplets (a) 60° (b) 120° (c) 180°

Finite Element Analysis of Hydrogen Desorption Behavior in Hyper-Elastic Materials using Coupled Diffusion-Deformation Model

A comparison of how EPDM and NBR perform during depressurization, focusing on the amount of hydrogen they retain and the stress buildup, was analyzed based on a single cavity model of the polymers. Then, a double cavity model of the NBR was studied to reveal the extent to which each cavity retains hydrogen concentration during the whole pressurization and depressurization cycle.

(a)

(b)

Change of Hydrogen Concentration for (a) Pure EPDM and NBR (b) Double cavity NBR, with respect to time