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Energy And Environment Sep 2024 - Jan 2025
Title: Quantification and Analysis of Land Surface Albedo: A Case Study of Dhaka, Bangladesh
Supervised By:
Assistant Professor, Department of Mechanical Engineering, BUET
Ph.D. (Connecticut, USA), B.Sc. Engg. (BUET)
Research Outline:
Dhaka is one of the most densely populated cities in the world. I have been living in this megacity for over a decade and have witnessed how urban planning is nothing but a joke here. This has made Dhaka rank among the least livable cities globally. Among its hundreds of problems, one of the challenges is the extreme heat during April and May, which, combined with the region's high humidity, creates unbearable conditions.
Our research focuses on studying the urban heat island effect in Dhaka and how different surface types influence albedo, which directly impacts temperature. Albedo refers to the ability of a surface to reflect sunlight. Surfaces with higher reflectivity absorb less solar energy, helping to reduce heat buildup.
We have successfully calculated the albedo of Dhaka's surfaces and created visual representations of the data. Currently, we are analyzing these findings for further insights into how urban surfaces contribute to the city's heat challenges
Research Outline:
Dhaka is one of the most densely populated cities in the world. I have been living in this megacity for over a decade and have witnessed how urban planning is nothing but a joke here. This has made Dhaka rank among the least livable cities globally. Among its hundreds of problems, one of the challenges is the extreme heat during April and May, which, combined with the region's high humidity, creates unbearable conditions.
Our research focuses on studying the urban heat island effect in Dhaka and how different surface types influence albedo, which directly impacts temperature. Albedo refers to the ability of a surface to reflect sunlight. Surfaces with higher reflectivity absorb less solar energy, helping to reduce heat buildup.
We have successfully calculated the albedo of Dhaka's surfaces and created visual representations of the data. Currently, we are analyzing these findings for further insights into how urban surfaces contribute to the city's heat challenges
Undergrade Thesis Dec 2023 - Present
Title: Computational study of the Influence of Variable Speed Continuous-flow Left Ventricular Assist Device (LVAD) on the Cardiovascular System in End-Stage Heart Failure.
Supervised By:
Associate Professor, Department of Mechanical Engineering, BUET
Ph.D. (Michigan State University, USA), M.Sc. Engg. (BUET), B.Sc. Engg. (BUET)
Research Outline
In this work, we developed a 0-D lumped parameter to study the influence variable speed Continuous-Flow Left Ventricular Assist Device (CF-LVAD) on cardiovascular system in MATLAB. The model was developed for an infarcted heart in an end stage heart failure patient.
For 0-D modeling of the cardiovascular system, it is required to develop a closed loop circuit model of the whole circulatory system. The circuit is analogous to electrical circuit (Fig-1) e.g. here driving force is pressure just like the voltage in electrical circuit. We used an already developed circuit provided by our supervisor. We modified different parts of the model such as, adding an LVAD parallel to the left ventricle, change the method of control. Also, the model was for a fixed heart rate which we converted into a variable heart rate.
We took the data of heart rate with time for different activities e.g. moderate exercise (Fig-2), walking etc. We then observed the changes in LV volume, LV pressure, RV volume, RV pressure , plotting their graph in MATLAB.
Updates
We submitted a paper for BSME conference which will be held in December 2024 at BUET titled 'The Computational Study on the Influence of Variable Speed Continuous-Flow Left Ventricular Assist Device on Right Ventricular Performance in End-Stage Left Ventricular Failure '.
The positive effect of Speed-varying CF LVAD in the Right Ventricle over CF LVAD is presented in the paper
We are drafting a paper targeting a journal to present our whole work in 0-D Lumped Parameter model
We are learning to develop the model in 3D using opensource platform FEniCS
Fig-1: Closed Loop Circuit Model of Circulatory System with LVAD
Fig-2: Variation of Heart Rate with Time
Variation of SV with respect to cardiac cycle time
Variation of ESP w.r.t cardiac cycle time
Figure: Visual representation of albedo across Dhaka's surface
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