http://localhost:8081/jspui/handle/123456789/121 2026-05-10T05:38:02Z http://localhost:8081/jspui/handle/123456789/20782 Title: NUMERICAL INVESTIGATION OF BURNING BEHAVIOR OF POWER CABLES Authors: Meena, Mukut Kumar Abstract: Numerical simulation is used to increase the knowledge base for the failure of instrumentation or control cables utilized in the power industry. With the development of new technologies, the energy demand is continuously increasing and so for the transmission of these energies power cables are required. Nowadays, there are many incidents in industrial as well as residential areas where cables become one of the major concerns because of their combustible nature and it becomes a source of fire itself. The help of numerical modeling of fires in cables can help in the development of procedures, and norms, which we can implement, to protect the personnel to prevent material and economic losses. The model used for the simulation includes the electrical core of the conductors, the enveloping insulation, the filler material, steel armour, and the jacket. A constant current is supplied to the cable for study one but during the second study, a continuous current is supplied simultaneously with an average heat flux applied to the cable for one-fourth part of the cable until a short circuit in the cable i.e. failure of the cable after average heat flux applied than the third study started with same conditions only change is that there is an internal fire in the cable due to short circuit, and after complete burning of the cable cooling phase of the cable has been started i.e. the fourth study. The temperature distribution of the different layers of the cable, and incident heat flux will be measured for the ten different simulations with necessary changes according to experiments and to validate these numerical data compared them with experimentation, the correlation was found to be a conservative estimate of the time of failure. 2022-04-01T00:00:00Z http://localhost:8081/jspui/handle/123456789/20781 Title: PLATE HEAT EXCHANGERS: AN INVESTIGATIVE STUDY Authors: Ali, Noureldin Omer Abdellatif Abstract: A gasket plate heat exchanger is a vital heat recovery equipment that exchanges heat from high to low fluid Temperature with the help of corrugation plates. The heat exchanger plates provide a large surface area for heat transfer per unit volume. So now days play an important part in industrialized society, as energy demands rise, and its performance must increment as well. They have been widely used in various industrial applications, including chemical, chilling water and dairy. In the present work, the thermal modeling and optimal solution design of the gasket plate heat exchanger have been presented. For the numerical simulation and range of operating parameters and geometrical have been considered. for performance of the gasket plate heat exchanger has been studied in terms of effectiveness, heat transfer and pressure drop for both fluids. Correlations have been developed to calculate the heat transfer, effectiveness and friction coefficients using the analysis regression process. The next step has been optimized for the single objective and multi-objective functions, applying genetic algorithm optimisation “MATLAB TOOLS OPTIMIZATION.” This work aims to minimize the entropy generation units (Ns) and annual cost (TAC) for two independent objective functions. The results of optimized designs have been solved after generations for two objectives, single objective and multi-objective Optimization. The optimum solutions decision has been compared for constraint heat transfer and unconstrained optimisation. 2022-11-01T00:00:00Z http://localhost:8081/jspui/handle/123456789/20780 Title: PERFORMANCE ANALYSIS OF EVACUATED TUBE SOLAR COLLECTOR FOR DIFFERENT CONFIGURATIONS OF THE ABSORBER Authors: Singh, Shivani Abstract: Solar water heaters (SWHs) are well-established and widely utilized worldwide in renewable energy technology. For low to moderate temperature applications, Flat Plate Solar Collectors are used. There are some advantages like ease to manufacture, no complex tracking devices, utilization of both the diffuse and beam solar radiation components, etc. With these advantages, there are certain limitations, i.e., conduction, convection, and radiation heat loss from the absorber plate. One can reduce the loss by providing proper insulation, incorporating a glazing cover, maintaining the vacuum between the absorber plate, and glazing (to avoid conduction and convection losses), and using a selective absorber surface (to prevent radiation losses). Though it is technically feasible, there are some practical limitations to achieving the above-said objectives (to reduce losses in an FPC). To overcome the above-mention functional limitations evacuated tube solar collectors came into existence. ETSC has two co-axial glass tubes with a selective coating over the inner tube surface and the system maintains a vacuum between tubes. As a part of the thesis, a series of experimental studies has been conducted and compared the performance of marquise shape FPC and ETSC in various modes (with & without glazing in series & parallel orientation for marquise shape FPC and with different reflectors configurations for series & parallel orientation for ETSC) in a forced circulation mode. The study on marquise shape FPC (for 1 to 7lpm, for the month of Sept-Oct 2021) shows that the first law efficiency increases (for 1 to 4lpm) and then decreases (for 4 to 7lpm). The exergy efficiency decreases as the mass flow rate increases (for 1 to 7lpm). The maximum temperature difference acquired was 14.49°C (for the series glazed system, for constant solar Irradiation value). The series glazed system shows better performance for lower lpm and the parallel unglazed system shows better performance for higher lpm. A study of ETSC and its comparison with marquise shape FPC, (for 1 to 4lpm and constant solar irradiation value for the month of March 2022, for Ac is 1m2 and for an, I value of 920W/m2) shows that the marquise shaped flat plates have acquired the maximum temperature difference up to 9.38°C (for the series glazed system) and 7.66°C for ETSCs with flat reflector. The results show that marquise shape flat plate collectors have better performance output than ETSC in forced circulation mode. The performance comparison of six different ETSC systems (without reflector, flat reflector, triangular reflector; in both series and parallel) has been carried out. The average Qu in a day (for the same inlet conditions) is getting higher for the flat reflector system with series orientation. The triangular reflector system shows better Qu than other systems when the sun is at its zenith. 2022-04-01T00:00:00Z http://localhost:8081/jspui/handle/123456789/20779 Title: PIN FINNED COOLING: INVESTIGATION OF DESIGN AND PERFORMANCE Authors: Bhaware, Amrutaunsh Abstract: Gas turbines play an important part in industrialized society and as power demands is increasing, gas turbine power output and thermal efficiency must increase as well. The energy of burning gases and air, which is at high temperature and pressure, is harnessed by the gas turbine power plant by expanding through numerous rings of fixed and moving blades. The principal failure mode of gas turbine blades is 'creep', which is caused by thermal loads. Despite their thickness, turbine blades break before compressor blades. Blade cooling is critical because it permits gas turbines to operate at temperatures above the melting point of the blade material, which is +300°C. Pin-fin is one of the most effective ways used for cooling of gas turbine blades. In the present work, effect of pin fin has been presented with the help of Numerical modelling using Ansys Fluent. The combinations of two different shaped fins are taken into account i.e., one with 45 tilted elliptical shape and other with diamond shape arranged in staggered array is selected. Streamwise and spanwise directions are taken as Sx/D = 2.5 and Sy/D = 2.5 whereas H/D = 2 is taken. In current numerical study we determined the Nusselt No. and friction Factor through pin-fin array for the Reynolds number between 10000 to 50000. Results showed that with increase Reynolds no. thermal performance of pin-fin decreases. 2022-04-01T00:00:00Z