Qualification: 
M.Tech
harikrishnang@am.amrita.edu

Harikrishnan G. currently serves as Assistant Professor at the Department of Mechanical Engineering, Amrita School of Engineering, Amritapuri. He has completed M.Tech. in Thermal and Fluids Engineering from Amrita School of Engineering, Amritapuri.

Publications

Publication Type: Journal Article

Year of Publication Title

2019

Sarun P. Pillai, B. R. Abhiram, Akshay S. Kumar, U. S. Ashish, and Harikrishnan G., “Solar powered desktop CNC machine for fabric and paper cutting”, IOP Conference Series: Materials Science and Engineering, vol. 577, p. 012071, 2019.[Abstract]


In the modern era Computerized Numeric control (CNC) machines are widely used in most of the industries around the world. Nowadays this technology has been used in almost all industries for different operations like cutting, milling, welding, etc. This paper presents the design and manufacturing of a solar powered, portable LASER CNC machine for cutting paper and fabric. The design procedure includes the calculations for finding torque required to run the machine, Factor of Safety etc. Modelling and analysis of the machine is carried out using soft wares like Solid Works and Ansys. The electronic circuit included in the assembly will convert the G-Codes into movements of CNC machine. Incorporation of Solar panels into the assembly helped to make this CNC machine work on clean energy. The results show that the machine is feasible at a reasonable cost for applications where speed and repeatability is achieved while not compromising on accuracy.

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2019

Harikrishnan G. and Ebin P. S., “Numerical study of heat transfer enhancement in fin and tube heat exchangers using curved semi wavy vortex generators”, IOP Conference Series: Materials Science and Engineering, vol. 577, p. 012001, 2019.[Abstract]


This paper deals with a three dimensional numerical study of heat transfer and pressure drop for fin and tube bank heat exchanger with a vortex generator. A new type of vortex generator, curved semi-wavy vortex generators (CSWVGs) is introduced and compared its performance. The computational domain consists of a small portion between two adjacent fins and air is used as the working fluid. The vortex generators are punched out from the fin surface. the analysis show that with the use of new vortex generators convective heat transfer rate has been increased by increasing the solid to fluid interaction through delaying the boundary layer separation, directing the working fluid to the wake region and bringing vortices into the working fluid. The most favourable position and geometric parameter of the new CSWVGs are found by studying the average Nusselt number and friction factor at various Reynolds ranging from 800 to 2000.

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2018

N. Jayakrishnan, Pradeep Namboodiri, Athul V. A., Uday Raj, Nithin M., and Harikrishnan G., “Design and manufacturing of a portable pneumatic material handling equipment”, IOP Conference Series: Materials Science and Engineering, vol. 377, p. 012044, 2018.[Abstract]


Many of the production and manufacturing firms adopt workspace automation for fast and economic production. Automation can be accomplished through hydraulics, pneumatics and robotics. This paper present the design and manufacturing of a portable pneumatic material handling system that can rise and move weight up to 3 kg. Such a machine can be used as a transport or positioning equipment in small scale production units. The design procedure includes the design of pneumatic cylinders, gears and arms. Then different components were manufactured according to the designed data and finally the assembled pneumatic framework is tried with the required weight.

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Publication Type: Conference Proceedings

Year of Publication Title

2017

Ebin P. S. and Harikrishnan G., “Heat transfer enhancement of CFL bulbs inside wall ceiling using extended surfaces”, 2017 2nd International Conference for Convergence in Technology (I2CT). 2017.[Abstract]


This paper suggest a method for enhancing heat transfer from a 15W CFL bulb inside a wall ceiling without compromising its luminous intensity. Inside wall ceiling, bulbs are generally subjected to low heat interaction with the surroundings due to the presence of stagnant air around the lateral surface. In this work we are introducing fins to this lateral surface to improve heat transfer to the surroundings and there by maintain the bulb surface temperature with in a comfortable range. Heat transfer analysis were performed for the bulb with and without attaching fins and compared. Results shows that addition of fins considerably reduces the bulb's surface temperature.

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2015

Mithunkrishnan G. and Harikrishnan G., “Heat Transfer and Pressure Drop Analysis of Lotus Porous Metals”, 42nd National Conference on Fluid Mechanics and Fluid Power (FMFP), NITK Surathkal, Karnataka, India. 2015.

2014

Harikrishnan G., Ebin P. S., and Jayakumar J. S., “CFD Simulation of subcooled flow boiling using OpenFOAM”, 1st International Conference on Advances in Mechanical Sciences 2014, no. 2. Vardhaman College of Engineering (VEC) Hyderabad, pp. 441-447, 2014.[Abstract]


Subcooled flow boiling in vertical channels have many industrial applications, including heat removal from core of nuclears. In the present work, subcooled flow boiling is simulated using open source simulation software OpenFOAM. A new solver is developed based on the OpenFOAM framework to predict subcooled flow boiling by incorporating various flow boiling models. Vapor generation in the heated wall is modeled with a wall heat flux partitioning model. Additional source terms are added to the governing equations to account for the phase change process. Energy equation is implemented for the liquid phase. The solver is validated against benchmark calculation of the DEBORA subcooled boiling data.

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2014

Ebin P. S., Harikrishnan G., and Jayakumar J. S., “Modeling of vapor bubble condensation in vertical rectangular channel using OpenFOAM”, 1st International Conference on Advances in Mechanical Sciences 2014. Vardhaman College of Engineering (VEC) Hyderabad., pp. 72-77, 2014.[Abstract]


This paper deals with the development and validation of a new solver in Open FOAM, bubble Condense Foam for modeling a condensing vapor bubble in subcooled boiling flows. This solver is used to predict the behavior of a vapor bubble in the flow in terms of bubble diameter and void fraction with respect to parameters such as subcooling temperatures, initial bubble diameter etc. VOF model is used to predict the interface of the bubble. Three conservation equations each for liquid and the gas phase are solved. Standard k-ε turbulence model consisting of two transport equations for turbulent kinetic energy and turbulent dissipation are used. The code developed is found to be capable of calculating condensation. However previous studies for modeling bubble condensation doesn’t consider the lift-drag models, this study incorporates the lift-drag models with governing equations, which improves significantly the bubble diameter prediction.

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