Faculty Publications
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Item Computational Modelling of Bioheat Transfer for Hyperthermia Using Finite Difference Method(Springer Science and Business Media Deutschland GmbH, 2023) Hegde, T.; Maniyeri, R.Bioheat transfer is a field which involves the study of thermal energy in living systems like tissues. Penne’s bioheat transfer equation is a popular model used in this field. The objective of this study is to develop a computational model to understand the effect of different heating methods like magnetic hyperthermia and laser treatment for living tissues with an embedded tumour. This is done by solving Penne’s bioheat transfer equation using finite difference method for a two-dimensional domain. Initially, Penne’s model in its one-dimensional form is used to observe heat transfer in a living tissue. After validating the results, the model is extended to a two-dimensional domain with an embedded tumour. The properties of the healthy tissue and the tumour cells are considered to be different. Using different heating methods, the temperature of the tumour is raised to 40–43 ℃ to damage the tumour cells, and the time taken for necrosis is found. The results obtained will be useful for tumour detection and also its treatment. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.Item Numerical Study of PCM-Based Energy Storage System Using Finite Difference Method(Springer Science and Business Media Deutschland GmbH, 2024) Abhijith, C.; Maniyeri, R.Energy storage systems incorporating phase change material (PCM) are becoming the answer to intermittent energy availability in the area of solar cooking vessels and solar room heating systems. These thermal energy storage systems are efficient, reliable and can reduce running costs and investments. The present work investigates the melting of n-octadecane using enthalpy formulation method by using finite difference method-based discretization. Accordingly, a numerical model is developed in MATLAB which is validated first by comparing with previous works. Further using the developed model studies on wall materials, thickness, different PCMs and temperatures are carried out. It is found that metal containers with higher thermal conductivities provided significant boost in energy storage. The increased thickness of walls adds significant change only if containers are of lower thermal conductivity such as steel. Different PCMs are analysed, and their operating temperature and energy storage capabilities are studied. In addition, enthalpy equation in cylindrical coordinates is solved since practical PCM storages are commonly cylindrical in shape. At the end, the numerical results are compared with an experimental case with paraffin wax as PCM. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd 2024.Item Numerical Modeling of Skin Bioheat Transfer Using Finite Difference Method(Springer Science and Business Media Deutschland GmbH, 2024) Naveen Reddy, D.; Spandana Bhat, K.; Rajesh, P.; Krishna Kishore, R.; Abhiram, C.; Maniyeri, R.Skin bioheat transfer is heat transfer in the cross-section of the skin tissue. Pennes bioheat transfer equation is the basis of skin bioheat transfer. Finite difference implicit-based methodology is used for solving Pennes bioheat transfer equations. The numerical simulations are performed for one-dimensional and two-dimensional skin models with various heat sources, blood perfusion rates, and different parameters. Both steady and transient state equations for one-dimensional skin are analyzed by considering various cases like spatial heating, step heating, and constant surface heating for which temperature distribution over the cross-section of skin is plotted and results are validated. With solar radiation as the source of energy, simulation the maximum time of exposure of skin to solar radiation above which it is prone to sunstroke at a particular location is found to be around four minutes. For two-dimensional skin tissue the transient study for different heat sources like sinusoidal heat source, laser heat source, constant surface heating, point heat source for five different skin models is done and analyzed. A detailed study on cooling techniques is done for three different cooling conditions to find the best cooling method and concludes that ice cooling is better than others. Skin treatment for treating tumors by keeping the tumor tissue at a constant higher temperature which is also known as hyperthermia is studied. Also, the effect of sweating for skin tissue which is exposed to dissipated heat by an electronic chip is studied. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.Item Finite difference method based analysis of bio-heat transfer in human breast cyst(Elsevier Ltd, 2019) Patil, H.M.; Maniyeri, R.Bio-heat transfer is a branch of bio-medical engineering which has its foundation linked to engineering disciplines of heat transfer. The thermal properties and behaviour of various malfunctioning tissues in human body varies as compared with normal tissues. Among various cancer tissues one which is commonly diagnosed in women is breast cyst (cancer causing fluid). The aim of present work is to develop one, two and three-dimensional computational models to study bio-heat transfer problems using finite difference method. First of all, a numerical model based on finite difference method is developed to solve Pennes's bio-heat transfer equation in one-dimension to get temperature profiles normal to skin surface and validated with existing analytical solutions. Secondly, the numerical model is extended to study the thermal behaviour of human breast section embedded with cyst using two-dimensional cylindrical coordinate systems and validated with previous researcher's results. The effect of size, location and presence of multiple cysts on surface temperature is studied. Lastly, the work is extended for the case of three-dimensional breast section with cyst located at the centre. The numerical results obtained using one, two and three-dimensional computational models will be highly helpful in the early detection of breast cancer tissues and also the location of it inside the body. © 2019