http://210.212.227.212:8080/xmlui/handle/123456789/143 Sun, 17 May 2026 00:00:57 GMT 2026-05-17T00:00:57Z http://localhost:8080/xmlui/bitstream/id/52aa1766-b563-4848-a7df-36e395665fa7/close-up-handwritten-whiteboard-year-168763957.jpg http://210.212.227.212:8080/xmlui/handle/123456789/143 http://210.212.227.212:8080/xmlui/handle/123456789/219 EXPERIMENTAL INVESTIGATION ON QUENCHING OF LOW THERMAL CONDUCTIVE MATERIAL COATED CRYOGENIC TRANSFER LINE Nithya, Krishnan; Jesna, Mohammed Cryogenic fluids are frequently encountered in many applications, such as cryogenic cooling, material processing, biological tissue preservation, food engineering, aerospace field, cooling of superconducting devices and chemical process etc. It has been understood in pool quenching experiments, that the thin low thermal conductive coating layer on the wall can greatly improve the cooling performance, while less is known about flow quenching. In the present study, the experiments are to investigate cryogenic flow quenching of the horizontal stainless steel tubes with different coating layers on the inner walls. Two types of coating layers with various thicknesses were prepared with the help of paint epoxy on the inner surface of the tube. To investigate the thermo-electric property and thickness of the coating layer on the quenching performance, as compared with the uncoated and epoxy coated tube. Here we are using magnetic stirring and sonication method for coating. It is shown that a thin coating layer on the inner tube wall can significantly shorten the quenching time and enhance the heat transfer performance. To analyse the heat transfer characteristics, an inverse heat conduction equation with consideration of variable thermo-physical properties and thermal contact resistance was numerically solved to obtain the inner wall temperature and heat flux. The reason for the quenching enhancement can be attributed to the shortening of the film boiling regime of cryogenic quenching in the inner surface by the coating layer which allows the improvement of Leidenfrost point (LPF) temperature. Mon, 12 Sep 2022 00:00:00 GMT http://210.212.227.212:8080/xmlui/handle/123456789/219 2022-09-12T00:00:00Z http://210.212.227.212:8080/xmlui/handle/123456789/206 THERMODYNAMIC MODELING OF HYBRID DESALINATION SYSTEM INTEGRATED WITH HUMIDIFICATION DEHUMIDIFICATION SYSTEM Rojini, S R; Baiju, V One of the largest environmental problems facing today is the fresh water scarcity in the world. On earth, 97% of total water is salt water and the remaining 3% is the freshwater. Desalination is the process by which the salt water or the brackish water can be converted into potable water so that the water scarcity can be reduced. Many desalination techniques such as multi-stage flash, multi-effect distillation, and reverse osmosis have been conventionally used but, they have limitations like high energy consumption, low water productivity and cost. The main advantage of this technique is that it can produce cooling along with potable water. The present study focuses on thermodynamic modelling of hybrid solar adsorption desalination and cooling system. Initially, a numerical analysis of the adsorption desalination and the cooling system operating with silicagel-water is carried out to determine its performance. Two modifications are incorporated for the improvement of the system performance. The first method is the use of suitable composite adsorbent made of silicagel as the parent material with combinations of aluminium fumerate and PVC. The second method is the integration of the humidification dehumidification unit to the conventional adsorption desalination system. The system is analysed by varying the operating parameters such as hot water temperature, cooling water temperature, condenser temperature and salinity on the water productivity, coefficient of performance and the energy requirement. The result reveals that the water productivity obtained from adsorption desalination and the cooling system operating with silicagel-water is 1.3kg/cycle, whereas with that of composite adsorbent is 1.54kg/cycle. For the hybrid system integrated with the humidification dehumidification unit the water productivity is found to be 2kg/cycle which is 23%more than the conventional system. Fri, 01 Jul 2022 00:00:00 GMT http://210.212.227.212:8080/xmlui/handle/123456789/206 2022-07-01T00:00:00Z http://210.212.227.212:8080/xmlui/handle/123456789/205 EXPERIMENTAL AND NUMERICAL STUDY ON THE IMPACT OF THERMAL CHARACTERISTICS OF DIFFERENT PCM IN DOUBLE GLAZED WINDOWS Rahul, Rajeev; Shafi, K A Green building designs are gaining traction in the current scenario, as today's energy source has a significant environmental impact due to its reliance on fossil fuels. Furthermore, fossil fuel sources are depleting at the same time as energy demand is quickly increasing. The construction or industrial facilities sector accounts for up to 40% of worldwide energy demand. Heating, ventilation, and air conditioning (HVAC) systems are responsible for more than 60% of overall energy usage in buildings, with glass windows being the primary source of heat load. Because windows are an essential aspect of a building's system for obtaining natural light, they cannot be overlooked when designing a structure. The present work investigates the effect of the phase transition or melting temperature of PCMs when used in double-glazed windows. Its impact on the heat and light transfer characteristics were analyzed using experimental and numerical methods. The PCM acts as latent heat storage and reduces the heat in leak to the inner space. The goal of this study is to limit the amount of heat that is conveyed to the inside through the glass. An experiment was conducted for each PCM material with different phase transition temperatures to determine the glazing's inner and outer surface temperatures in a controlled environment. To validate the experimental results ANSYS FLUENT software was utilized to conduct the numerical analysis. Windows with PCM filled between two glazing’s were discovered to efficiently reduce the inner surface temperature of the glazing along with reduction in heat transfer. The main parameter that was taken into consideration in this work is the phase transition temperature. PCMs having different melting temperatures are used to establish that the phase transition temperature plays an important role in the proper usage of PCM in double-glazed windows. In the investigation, it was observed that the utilization of PCMs diminishes as phase transition temperatures rise. We must choose the right width for the double glazing to make up for this. The solidification of the liquefied PCM happens slowly and the glazing's ability to transmit light is unaffected if the PCM's melting temperature and thickness of the PCM layer is selected based on the atmospheric condition. Fri, 01 Jul 2022 00:00:00 GMT http://210.212.227.212:8080/xmlui/handle/123456789/205 2022-07-01T00:00:00Z http://210.212.227.212:8080/xmlui/handle/123456789/204 NUMERICAL INVESTIGATION ON HEAT TRANSFER FROM A PHASE CHANGE MATERIAL BASED HEAT SINK WITH AND WITHOUT BAFFLES Athulya, K S; Leena, R For cooling portable electronic devices, effective thermal management (TM) depending on phase change material (PCM) is used. To absorb the thermal energy that all such devices release, PCM is used in the heat sink. The aim of this study is to determine how to increase the charging period of PCM. This work reports the results of detailed numerical studies carried out to improve the performance of a PCM-based heat sink in the charging cycle using baffles. Baffles are horizontal plate-fin structures made of aluminium. Two numerical studies were carried out. The first one is a comparative studyon heat transfer from PCM-based heat sinks with and without baffles. The PCM used is n-eicosane. The second one is a comparative study of two PCMs, rubitherm and n- eicosane. And validation of experimental data is done. From the numerical study a heat sink with baffles filled with a 0.9 volumetric fractionof n-eicosane shows the best performance. Rubitherm filled in the heat sink without baffles shows the best heat transfer. The investigation of PCM-based heat sinks with and without baffles revealed that more than 51% of the temperature differential was caused by baffles. Fri, 01 Jul 2022 00:00:00 GMT http://210.212.227.212:8080/xmlui/handle/123456789/204 2022-07-01T00:00:00Z