Imperial College London

DrTribeniRoy

Faculty of EngineeringDepartment of Mechanical Engineering

Research Associate
 
 
 
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Contact

 

t.roy Website

 
 
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Location

 

606City and Guilds BuildingSouth Kensington Campus

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Summary

 

Overview

My research themes include-

- Supercapacitors for energy storage

- Micro-nano manufacturing processes (understanding the mechanisms at different length scales viz. nano-micro-macro and coupling the behaviour using multiscale modelling)

- Generation of micro/nano textures for enhancing surface properties in applications that include biomedical implants, superhydrophobic surfaces, electrodes for supercapacitors, minimizing friction in tribological applications

Supercapacitors using ionic liquids

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My current research work involves dynamic density functional theory (DDFT) and continuum scale modelling of high performance supercapacitors to understand

- Charging and discharging dynamics (ionic liquids)

- Temperature dependent performance of supercapacitors

- Effect of power cycling on the performance of supercapacitors

3-D hemispherical convex micro features

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3-D hemispherical protruded micro features find wide application in various fields of surface engineering viz. micro lens let arrays, solar cells, energy conversion devices, heat transfer applications, tribological applications and many more. Fabrication of 3-D hemispherical convex micro features is difficult by any traditional micro manufacturing process. My PhD research work was aimed at

- Developing single as well as arrayed micro features using a modified reverse micro electrical discharge machining process (RMEDM)

- Atomic scale understanding of the material removal phenomena and the effect of discharge on adjacent craters using molecular dynamics simulation

- Continuum scale modelling to understand the multiple physical phenomena governing the generation of shape and surface roughness of these features

Superhydrophobic surfaces

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Superhydrophobic surfaces have become an active area for research in the recent years due to the desire for achieving self-cleaning, anti-sticking and non-wetting properties on surfaces. A superhydrophobic surface achieves a water contact angle of 1500 or greater. Research works carried out was aimed at

- Understanding the physics of the behavior of water droplet as it rests on a micro textured surface

- Mathematical modelling of superhydrophobic surface to determine the relation between water contact angle and geometrical parameters of the micro-textured surface

- Developing in-house water contact angle measurement system

-Fabrication of micro textured arrays using LIGA, wire EDM and wire-wound method and analyze the effect of water droplet on the textures


Multi-objective optimization using fuzzy AHP, fuzzy TOPSIS and Taguchi's OA technique

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Conventional Taguchi's OA is applicable for optimization single objective functions. Research was carried out to extend the Taguchi's OA technique in multi-objective optimization processes by

- Combining the multiple objectives by prioritizing and ranking them using fuzzy AHP and fuzzy TOPSIS

- Use signal-to-noise ratio for determining the optimal parameters (Taguchi's OA)

- Case study of the model by optimizing three objectives (material removal rate, tool wear ratio and tool over cut) in Electrical Discharge Machining

Nano finishing

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Nano finishing process are extensively employed for generating atomically smooth surfaces on biomedical implants, semiconductor devices and so on. Research work carried out in this domain include

- Molecular dynamics simulation to understanding the behavior of material removal on two different types of engineering materials aluminium (soft) and silicon (hard) by mechanical polishing

- Tool-workpiece interaction in nano finishing