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Rahul, S.
- Fabrication and Performance Improvement of Heat Exchanger using Wire Coil Inserts with Hybrid Nano Particles
Authors
1 T. S. Srinivasan Centre for Polytechnic College and Advanced Training, No. 1, TVS School Road, Vanagaram, Chennai, IN
Source
Manufacturing Technology Today, Vol 18, No 8 (2019), Pagination: 29-42Abstract
In the last decade, a number of investigations have been conducted to identify the possible mechanisms that contribute to the enhanced effective thermal conductivity of nano particle suspensions [Nano fluids]. The thermal performance of heat exchangers depends on a variety of factors including geometric, kinetic and spatial aspects related to the net heat transfer rate encountered between the heat transfer sections and flow of fluids.
A laminar flow convective heat transfer of Al2O3 - Cu + Water nanofluids flowing through a horizontal tube heat exchanger pipes with and without coil inserts were experimented. For this purpose, Al2O3 - Cu nano particles were synthesized, characterized and dispersed in distilled water to form stable suspension containing 0.1% volume concentration of nanoparticles. Two wire coil inserts were made of Cu was introduced in the heat exchanger tubes to increase the heat transfer performance of nano fluid flowing in it. The performance of nano fluid in heat exchanger with and without wire coil inserts were calculated and reported.
Keywords
Temperature, Heat Exchanger, Fluid Flow, Nanoparticles, Inserts.
References
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- A Study of Additive Manufacturing in the Field of Mems Manufacturing
Authors
1 T. S. Srinivasan Centre for Polytechnic College and Advanced Training, Vanagaram, Chennai, IN
Source
Manufacturing Technology Today, Vol 19, No 9 (2020), Pagination: 3-7Abstract
The recent success of additive manufacturing processes in the manufacturing sector has led to a shift in the focus from simple prototyping to real productiongrade technology. Additive manufacturing is a relatively recent manufacturing method which has become a key area of interest in multiple industrial sectors. Deriving from CAD models the process can be used to create solid yet highly complex parts and pushes towards a tool-less manufacturing environment meaning improved quality and better efficiency in many cases. The enhanced capabilities of Additive Manufacturing processes to build intricate geometric shapes with high precision and resolution have led to their increased use in fabrication of Micro Electro Mechanical Systems (MEMS). The Additive Manufacturing technology has offered tremendous flexibility to users for fabricating custom - built components. Over the past few decades, different types of Additive Manufacturing technologies have been developed.
This article provides a comprehensive review of the recent developments and significant achievements in most widely used Additive Manufacturing technologies for MEMS fabrication, their working methodology, advantages, limitations, and potential applications. Furthermore, some of the emerging hybrid Additive Manufacturing technologies are discussed, and the current challenges associated with the Additive Manufacturing processes are addressed. Finally, future directions for process improvements in Additive Manufacturing techniques are presented.