Vinay Aggarwal ¹, Bharat Kalsi ¹, Satbir S. Sehgal ¹

Affiliations
1 Mechanical Engineering Department, Chandigarh University, Sahibzada Ajit Singh Nagar – 140413, Punjab, IN

Abstract

Objectives: The research work studied so far doesn’t involve much work on Spiral Micro-channel so the concept of spiral micro channel was proposed. To determine pressure drop and temperature drop with varied flow-rate at constant heat source in spiral micro channel. Methods: The computational heat transfer analysis on Spiral Micro-channel Heat Sink (SMCHS) has been performed with varied mass flow rate of 1-3 kg/hr in two different flow arrangements. One when the fluid Entry at Inner Spiral (IS) and another when the fluid Entry at Outer Spiral (OS). Both the cases are compared at the constant heat input, which was given at the bottom surface of the SMCHS. The CFD analysis determined the point parameters at inlet and outlet of Spiral micro channel. Findings: The computational fluid dynamics analysis shows the less pressure drop and temperature drop results when fluid entry at IS as compared to OS for every flow rate; which is an innovation. The computational results show that pressure drop decreases by 2.39% and temperature drop decreases by 6.99% when fluid entries at IS as compared to OS. Applications: The spiral micro channel has a wide application in the area of electronic cooling; futuristic application is to cool the armor, spot welding etc.

Keywords

Heat Sink, Spiral Micro-channel, Spiral Eye.

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Bharat Kalsi ¹, Vinay Aggarwal ¹, Satbir Singh Sehgal ¹

Affiliations
1 Department of Mechanical Engineering, Chandigarh University, Gharuan - 140413, Punjab, IN

Abstract

Objectives: The aim of the present work is to understand the physics of the mixing of fluids, velocity variation and pressure drop within micro channel using computational fluid dynamics and experimental technique. Methods/Statistical analysis: The computational fluid dynamics was performed at four different types of angles (300, 450, 600, 900) at constant flow rate 0.5 lph and experimental analysis was carried out at 60-degree angle at different flow rate (1lph, 1.5lph, 2lph, 2.5lph). The simulation and experimental was performed using three fluid mixing case of water +water; water +ethanol and water +glycerol. Finding: At a constant inlet flow rate of 0.5 lph and at 600 degree angle the percentage variation between experimental and simulation results was observed to be in the range of 2.97-3.14% in water +water; 2.31-2.83% in water +ethanol and 19.62- 20.56% in water +glycerol case. It has been observed that velocity is maximum at outlet when the mixing angle was 600 the % age increase in velocity between inlet and outlet in all the 04 angles was 78-114%. Application/Improvements: The application of the microfluidic devices is drug discovery, biomedical analyses, genetics, proteomics, biological and chemical reactions etc.

Keywords

Ethanol, Glycerol, MicroFluidics, Mixing, Water.

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Yogesh Rathee ¹, Vinay Aggarwal ¹, Abhay Sehgal ¹

Affiliations
1 Department of Mechanical Engineering, Chandigarh University, Gharaun, Punjab, 140413, IN

Abstract

Objective: To perform micro-casting operation by melting lead powder in a micro mold with the help of microwave radiation to get minute shapes in casting. As per the previous research studied, the work on the micro-casting with different shapes has not been done. Methods: Micro mould has been fabricated with the help of vertical machining center. Lead powder has been heated with the help of microwave radiations. Before the experimentation micro mould of graphite of having shapes of star type, and circular has been fabricated using vertical machining center. Findings: Different sizes of 1 mm, 2 mm, 3 mm, 4 mm and 5 mm of Pb powder was fabricated by melting lead powder in microwave oven and weights are measured in gram which involves innovation using XRD. Applications: Ink Printing, Shape Deposition, Investment Casting, Wax pattern, etc.

Keywords

Lead Powder, Micro-Casting, Microwave Radiations.

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