:-Fluid mechanics always plays a predominant role in different kinds of engineering streams. The study of fluid flows is always an area of interest and it consists of different applications like flow past cylinders, flat plate, and flow over suddenly expanded geometries. This paper deals with the experimental study of fluid flow over suddenly expanded geometries at different Reynolds numbers. It is difficult to identify the flow phenomena when the flow is inside a pipe. Hence the fluid is made to flow in an open channel so that the flow phenomena can be easily observed. A suddenly expanded geometry is introduced during this flow at a certain distance and a flow phenomenon is observed. Due to the expanded geometry vortex flow is created and this vortex flow with different models at different Reynolds number is to be observed and analyzed. During the formation of vortex flow reverse flow occur this reverse flow is also to be investigated. The effect of change of geometry on vortex region is to be identified. By calculating various parameters like velocity, Reynolds number and Froude number the flow will be identified whether it is sub critical or super critical. Depending on the type flow it is to be analyzed. The flow conditions are observed by varying the shape of the object to be introduced in the flow. Analysis of the flow will be used to understand the concepts of vortex flow, reverse flow or recirculation zone, sub critical flow etc.Flow over suddenly expanded geometries includes various applications like body of an automobile etc. so the analysis of flow phenomena over the various shapes provides accurate solutions to various real problems.
Non-conventional systems are developed to produce cooling effect which use eco-friendly refrigerants and consuming less energy as input. In this work, a vortex tube refrigerator is fabricated from CPVC material, to which air is supplied through five tangential inlet nozzles at different inlet pressures. The inlet pressure is varied over a span of 1 kg/cm2 to 8 kg/cm2 with an interval of 1 kg/cm2. The difference between the temperatures of hot and cold air streams at outlet is observed to be increasing with time as well as for different inlet pressures. In addition the COP for the cold end side is observed to be more than at the hot end side and isentropic efficiency is observed to be increasing with inlet pressures.
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