Highlights

• Research areas over the years

• Undergraduate Thesis

• Thermal-Hydraulic Optimization of Heat Exchangers and ducts.

In this work, we aimed to improve heat exchanger tubes' thermal and hydraulic performance by employing Y-inserts with three distinct perforations. The objective was to increase the Nusselt number and reduce the friction factor to control the pumping power needs. We validated empirical, experimental, and numerical setups and employed hexagonal, trapezoidal, and kite-shaped perforations. We also employed 10,20 and 30% perforation index. 

The results are as follows:

• Trapezoidal 20% gathered the highest Nusselt number.

• Hexagonal 30% with the highest pressure drop.

• All three configurations showed minimal improvement compared to the existing literature.

In this work, the objective was to optimize the hydrothermal performance of water inside a rectangular duct. For this, we proposed five new configurations of vortex generators. After that, the best vortex generator was subjected to further modifications in terms of arrangements. We tried out vertical inclination angles and horizontal rotation angles with the best-optimized angles.

 The results indicated that:

• VG-1 performed better than others in both thermal terms and pressure terms.

• The 30-degree vertical inclination of VG-1 was better.

• 30-degree rotation was also found to be better than other rotations.

Output: Journal article in International Journal of Thermofluids (SJR: Q1, CiteScore: 9.2) [Link]

• Melting and Solidification of Phase Change Materials in Thermal Storage System

In this work, we tried to optimize the melting time of shell and tube thermal storage systems by employing PCMs and different fin sizes and shape configurations. The fastest melting and solidification for a designed fin yields the best results. Some of the snaps are given below.

Manuscript submitted to the Journal of Energy Storage

• Blood Flow Analysis in diseased artery with graft

In this work, circular and elliptical bypass shapes have been employed in a double-stenosed coronary artery. The bypass angle has also been optimized.

Accepted and Presented at the 1st IUT International Conference on Mechanical, Materials and Production Engineering (IUT-ICMMPE) 2023 [ResearchGate]

• Hemodynamic Analysis in Cerebral Aneurysm

The effect of cerebral aneurysms in a bifurcated artery has been analyzed. Hemodynamic parameters like pressure, wall shear stress, and velocity distribution have been evaluated. The dimensions of the arteries were extracted from CT-scan images and later recreated using SolidWorks.

Output: Accepted and Presented at the 14th International Conference on Mechanical Engineering (ICME2023) 

• Modeling Thermal Devices with CFD and Machine Learning

In this work, we are developing large CFD datasets, thermal-hydraulic parameters like Nusselt number, friction factor, thermal performance factors; entropic parameters. Further, we will develop predicting machine learning algorithms using these datasets.

Undergraduate Thesis

Title: Numerical and experimental investigation of the effects of novel vortex generators in a tube heat exchanger using water and nanofluid. 

Supervisor: Prof. Dr. Dewan Hasan Ahmed.

Timeline: 1 Year (December 2021- December 2022)

Synopsis: This dissertation investigated the implementation of novel Mobius Strip and Clover-shaped ring vortex generators to enhance the thermal-hydraulic efficiency of tubular heat exchangers using water and Al2O3-water nanofluid. 

Results

• Evaluated two new vortex generators, Mobius Strip and Clover Leaf Rings, under laminar and turbulent flows using water and 0.1% Al2O3/water nanofluid.

• Nanofluid in Mobius Strip enhanced overall thermal performance in both flow regimes. Mobius Strip Ring's n=6 configuration performed best, while Clover Leaf Rings at n=5 showed slightly higher overall thermal performance.

• Despite increased Nu (Nusselt) numbers, higher friction factors impacted the overall heat transfer performance, suggesting a trade-off between heat transfer enhancement and increased friction.