Volume 06 Issue 01

2019

 

Study of Stearic acid as Additive for the B io lubricant Formulations in Neem seed oil
Krishnaprasad .S. Menon, Arun Prakash, D. Mahipal | pp: 01-04 | Download Paper | Show Abstract

Abstract: Vegetable oils are being considered as a potential source of renewable energy and environmentally favourable lubricant for future generations due to its good lubricity, high thermal property and its biodegradability. This paper evaluate and compare the lubricant properties and environmental effects of Neem seed oil with and without additive with that of commercially available mineral oil SAE20W40. The lubricant properties such as tribological, thermal, rheological properties and environmental effects like the biodegradability are evaluated and compared. The neem seed oil are mixed with various proportions of stearic acid. The coefficient of friction and wear scar diameter of neem seed oil in combination with stearic acid seems to be less and more efficient than the plain neem and the mineral oil separately. The viscosity improvement with the addition of stearic acid in neem seed oil is negligible, but stearic acid is found to a viscosity index booster in neem seed oil. The addition of stearic acid helps to improve the pour point of base oil. The biodegradability of neem seed oil with and without stearic acid were determined and compared with SAE20W40.

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Experimental Investigation of Fault Detection in Ball Bearings using Vibration Signature Analysis
Varghese Thomas Pedikayil, A Samson, Akash Rajan | pp: 05-09 | Download Paper | Show Abstract

Abstract: Ball bearings are machine elements used in rotary machines to reduce friction and support radial and axial loads. During operation there are chances that these elements develop localized faults most probably on the races. To avoid catastrophic failure it is required to monitor the condition of the bearings and detect faults in it. Vibration Signature Analysis is widely used for condition monitoring of mechanical elements such as bearings, gears etc. Envelope detection is a signal processing technique for demodulation of vibration signals, it is a useful tool for the identification of faults. Time domain signals and order spectrum of healthy and faulty bearings were investigated. Statistical parameters such as Kurtosis and Root Mean Square of the time domain signals are also used to identify the presence of faults.

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Border Alert and Life Protection System for Fisher-men
Chairma Lakshmi K.R, Gnanasekaran T | pp: 10-15 | Download Paper | Show Abstract

Abstract: Investigating the border control and ensuring security in the borders is a life-threatening problem faced by many peninsular countries. The International Maritime Boundary Line between the countries is difficult to identify, which is the foremost motive for the cross-border cruelty for fishermen. Due to some unavoidable circumstances such as weather condition, fishermen’s abnormal body condition leads to a tough journey for them to work. The present invention generally relates to security and protection system for fishermen. More specifically, a system to prevent the fisherman from border crossing issue and to monitor the health status of the fisherman for ensuring safety and security using IoT devices.

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Numerical Investigation of Bio-inspired Heat Sink Model with Multiple Outlets for Cooling Rectangular Shaped Electronic Circuits
K. Kandassamy1, B. Prabu | pp: 16-22 | Download Paper | Show Abstract

Abstract: Cooling of electronic circuits is a necessity to ensure reliability and optimum working conditions. In this work a bio-inspired single-inlet flow field having leaf-type branching secondary micro-channel arrays, with aspect ratios 4.3, 8.6 and 12.9 is analyzed. The simulation of the heat sink models is done using finite element based software. The coupling between heat transfer and laminar fluid flow is done using conjugate heat transfer. The heat sinks are subjected to a constant heat flux input and tested for pressure drop of 0.2-0.3 MPa. Validation of simulation results is done by comparing the mixing cup temperature with that obtained by heat balance. The results prove that, bio-inspired model has a low variation in chip surface temperature than traditional micro-channel arrays. Higher aspect ratio models have higher Nusselt numbers for similar pressure drops. The heat sink models with aspect ratio 12.9 at an input pressure 0.3 MPa shows a thermal resistance of 0.126 C/W with pumping power -2.39W.

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