Background of the Problem: Heat exchanger is a device in which heat transfer occurs from hot fluid to cold fluid and vice versa; It is used for many applications particularly for process industries. Plate type heat exchanger gives better solution in terms of heat transfer, when compared with different types of heat exchangers. Design pressure is less than 20 bar, while design temperature is less than 180°C for a plate heat exchanger. Little rep orts were available on heat transfer analysis of corrugated plate heat exchanger with variation of viscosity of fluid and corrugation angle. Aim: Investigations were carried out to determine heat transfer rate of corrugated plate heat Original Research Articleexchanger with varied corrugation angles of 30°, 40° a nd 50° with varied test fluids of water, 10% glycerin, 20% glycerin and 30% glycerin. Methodology: A single corrugation pattern on three plates arranged in parallel with varied chevron angles with spacing between the plates was 5 mm. Cold water/10% glycerol solution/20% glycerol solution/ and 30% glycerol solution were used as cold fluids, with the flow being counter flow. Hot water at 70°C at constant flow rate was used for heati ng the test fuels. Design Variables: Test fluids of different viscosities and corrugation angles. Brief Results: It was observed that heat transfer coefficient was higher for a given Reynolds number for 50° corrugation angle compared to other corrugation angles of 30° and 40°. By using Regression analysis, a new correlation was developed for corrugated plate heat exchanger for the prediction of Nusselt number, which was a function of Reynolds number, Prandtl number and corrugation angle. Nusselt number predicted by correlation was correlated with experimental result, which was deviated by 8% only from actual experimental result. Also the correlation was compared with that of other researchers in order to validate the data.

No abstract

Abstract:The corrugated plate heat exchangers are widely used in food industry especially for pasteurization operations.Limited research work has been carried out on sinusoidal plate heat exchangers. In the present investigation, experimental studies have been carried out in a sinusoidal corrugated plate heat exchanger with water and glycerol solutions of varying concentration as test fluids. The plate heat exchanger is fabricated with two stainless steel sheets having a thickness of 1 mm forming a test channel having a clearance of 5 mm and of length 30cm. 3 such plate heat exchangers have been fabricated with corrugation angles of 30, 40 and 50 degrees. The effect of corrugation angle has been analyzed in detail and it has been observed from the experimental results that the corrugation angle is the major parameter that affects the pressure drop and the friction factor.

The corrugated plate heat exchangers are widely used in food and pharmaceutical industries. Sinusoidal plate heat exchangers are one of the types of corrugated plate heat exchanger. Limited research work has been carried out in this type of plate heat exchanger. In the present investigation, experimental studies have been carried out in a sinusoidal corrugated plate heat exchanger with water as the test fluid. The plate heat exchanger is fabricated with two stainless steel sheets having a thickness of 1 mm forming a test channel with a clearance of 5 mm and of length 30cm. 3 such plate heat exchangers have been fabricated with corrugation angles of 30, 40 and 50 degrees. It has been observed from the experimental results that the corrugation angle is mainly affecting the pressure drop and the friction factor. As the corrugation angle is increases, the pressure drop of the fluid is found to increase, which results in decrease in friction factor. These observations have been discussed in the paper.

The hydrofoil is one of the typical factors that affect the vortex structure and flow characteristics of hydraulic machinery. In order to enhance the utilization efficiency of hydraulic machinery in marine energy, parallel grooves are proposed and applied to the hydrofoil. Following that, a numerical analysis is performed using the SST k- turbulence model, and the effects of hydrofoil profile, angle of attack, and flow are investigated. The profiles of NACA 0066, NACA 8412, NACA M2, and RAE 104 are considered for the study. The performance is analyzed based on the lift to drag ratio. The best model from this is given with surface modification and the flow study is carried out at different angles of attack. The modified profile of NACA 8412 with parallel groves has shown the highest lift to drag ratio at a 12-degree angle of attack.