Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

This paper describes the design of a novel pneumatic gear shifting system to replace the existing gear stick manual shifting system for ease of the driver while shifting gears. The aim of this work is to have a semi-automatic shifting (pneumatic shifting) removing the need for the driver clutch operation. The system consists of a solenoid valve, CO2 gas-pressurized cylinder, double-acting cylinder, and single-acting cylinder. On basis of the signal received the gear needs to be changed, the shifter opens or closes a magnetic valve assembly. The solenoid valve allows the compressed air into the piston that comes from a pressurized cylinder, in order to create the effect of shifting gears. The pedal shifter and buttons are used to shift the gears. The pedal shifter was designed by using a 3-D printing technique using PLA material. The microcontroller used is ATMEGA-328 in this system. There are three switches, one for upshift, downshift, and clutch respectively. An algorithm has been created in a microcontroller for a sequential gearbox of CBR 600RR. The system has been so developed that the above idea can be used on different types of sequential gearboxes by modifying the algorithm with input changes to the force, torque, and length of the lever required to shift the gear with respect to the amount of gas consumed. The above work can be utilized in race cars to achieve a reduction in gearshift times. On perfect implementation of the pneumatic shifting system, the driver can put both hands on the steering wheel at all times.

VIT Unitversity

Department of Design and Automation

School of Mechanical Engineering

Vellore Campus

SAE Technical Paper Series

Design of a Novel Electro-Pneumatic Gear Shift System for a Sequential Gearbox

An experimental setup was developed to study the tribological characteristics in rectangular copper micro channels using TiO2 nanofluids. This experimental facility was used to study the influence of heat transfer, fluid flow and pressure drop mainly on the tribological aspects of the above flows. A Property like laminar friction affects the thermal performance of TiO2 based nano fluids in smooth micro channels in our setup. Properties like heat transfer coefficient like Reynolds number, Nusselt Number, Pressure drop, heat taken away, and rise in temperature of the coolant as it flows out of the micro channels, evaluated from the experimental data may get affected by laminar friction. © Nova Science Publishers, Inc.

World University root node

International Journal of Energy, Environment and Economics

Study of tribological aspects of nano coolant flows

Fluid power systems using oil hydraulics in earth moving and construction equipment have been using proportional and servo control valves for a long time to achieve precise and accurate position control backed by system performance. Such valves are having feedback control in them and exhibit good response, sensitivity and fine control of the actuators. Servo valves and proportional valves are possessing less hysteresis when compared to on-off type valves, but when the servo valve spools get stuck in one position, a high frequency called as jitter is employed to bring the spool back, whereas in on-off type valves it requires lesser technology to retract the spool. Hence on-off type valves are used in a technology known as digital valve technology, which caters to precise control on slow moving loads with fast switching times and with good flow and pressure control mimicking the performance of an equivalent "proportional valve" or "servo valve".

Fulltext

IOP Conference Series: Materials Science and Engineering

Simulation of proportional control of hydraulic actuator using digital hydraulic valves

A numerical study has been carried out to investigate the heat transfer enhancement and <a href="https://www.sciencedirect.com/topics/engineering/fluid-flow-characteristic">fluid flow characteristics</a> for various aspect ratios of <a href="https://www.sciencedirect.com/topics/engineering/rectangular-microchannel">rectangular micro channel</a> heat sinks (MCHS). The working fluid considered for the analysis is water. The fluid flow and heat transfer characteristics of a three-dimensional MCHS are obtained numerically by solving the appropriate governing equations. The flow domain is discretized as finite volume elements and solved using ANSYS CFX 14.5, commercially available CFD code. The numerically predicted results obtained through CFD code are validated with the experiments carried out and it is found that the maximum deviation between the two is less than 5%. Hence the CFD code is further extended to study the influence of geometrical parameters. The channel size optimization has been carried out numerically to obtain the effective heat removal from the MCHS. Average <a href="https://www.sciencedirect.com/topics/engineering/convective-heat-transfer-coefficient">convective heat transfer coefficient</a>, outlet temperature, friction and pressure drop, pumping power and <a href="https://www.sciencedirect.com/topics/engineering/thermal-resistance">thermal resistance</a> have been plotted against <a href="https://www.sciencedirect.com/topics/engineering/reynolds-number">Reynolds number</a>. Non-dimensional parameter, <a href="https://www.sciencedirect.com/topics/engineering/nusselt-number">Nusselt number</a> has been plotted as a function of Reynolds number for three heat sinks with different aspect ratios. <a href="https://www.sciencedirect.com/topics/engineering/friction-factor">Friction factor</a> and pressure drop across the channels are obtained and plotted across the channels.

Department of Automotive Engineering

Alexandria Engineering Journal

Influence of aspect ratio on the thermal performance of rectangular shaped micro channel heat sink using CFD code

An experimental setup was developed to study the heat transfer and fluid flow characteristics in rectangular copper microchannels with hydraulic diameter 29.4 microm using TiO2-Water nanofluids. The experimental facility is validated using existing correlations and subsequently tested with 0.1% and 0.3% concentrations of TiO2 nanofluids. The thermal resistance of heat sink with nanofluids is compared with the base fluid. It is inferred that 0.3% TiO2-Water nanofluids have 18% lower thermal resistance as compared to base fluid having for the same operating conditions.

Journal of Nanoscience and Nanotechnology

Thermal Performance of Higher Aspect Ratio Microchannels Using TiO2-Water Nanofluids

A theoretical solution for hydromagnetic convection over a continuously moving vertical surface with uniform suction is obtained. A flow of this type represents a new class of boundary-layer flow at a surface of finite length. The solutions for the velocity and temperature profiles are obtained. It is observed that the velocity decreases considerably in the presence of a magnetic field, as compared to its absence.

Acta Mechanica

Hydromagnetic flow and heat transfer on a continuously moving vertical surface

Theoretical solution for hydromagnetic convective flow over a continuously moving horizontal surface with uniform suction and internal heat generation/absorption is obtained. This represents a new class of boundary layer flow at a surface of finite length. The solutions for the velocity and temperature profiles are obtained for different parameters like Prandtl number, heat source parameter (α) and Hartmann number. It is observed that the velocity decreases considerably in the presence of magnetic field, as compared to its absence. The temperature increases in the presence of heat source and decreases in the presence of heat sink.