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Heat Transfer Augmentation of Latent Heat Thermal Storage Systems Employing Extended Surfaces and Heat Pipes
Published in Moghtada Mobedi, Kamel Hooman, Wen-Quan Tao, Solid–Liquid Thermal Energy Storage, 2022
The melting process of a PCM inside an externally heated spherical capsule can be categorized into constrained and unconstrained melting. In unconstrained melting, unmelted PCM is not fixed and sinks to the bottom of the sphere. As a result, heat is directly conducted from the shell to the solid PCM. This type of heat transfer is known as close contact melting. Whereas, in constrained melting, unmelted solid bulk is fixed and does not migrate in the capsule. In this case, convection is the main heat transfer mechanism between the unmelted solid PCM and shell. Constrained melting heat transfer of a PCM in a circumferentially finned spherical capsule was studied numerically and experimentally by Fan et al. [47] as shown in Figure 7.7. They investigated the effect of fin height on the melting performance of the LHTS system. The results revealed that the best performance was achieved by annular fin with the highest fin height due to the enhanced heat conduction and inducing local natural convection in the presence of the fin.
Effect of material and geometric parameters on natural convection heat transfer over an eccentric annular-finned tube
Published in International Journal of Ambient Energy, 2021
Issam Fourar, Abdelmoumene Hakim Benmachiche, Said Abboudi
In industrial applications, the demand of the natural convection heat transfer increases with the advance in technologies such as the cooling of electronic compounds, internal and external combustion engines, air cooling systems for air conditioning and refrigeration. The heat transfer in different heat exchanger types with fins has been studied thoroughly. Many researchers carried out extensive studies on the structure of heat exchangers and a lot of their studies deal with the optimisation and improvement of heat transfer for finned tube with annular fin. They come up with various form of fins, such as perforated fin, segment fin, hyperbolic annular fin, porous fins, inclined Plate Fins, eccentricity fin, B-spline curve annular fin, Annular Step Fin, helm-shaped fin, Rectangular Fins, etc.
Thermoelastic study of a functionally graded annular fin with variable thermal parameters using semiexact solution
Published in Journal of Thermal Stresses, 2019
Rajiv Ranjan, Ashis Mallick, Prasun Jana
When an equipment is working, whether it is a small electronic device or large equipment such as transformer, compressor, industrial heat exchanger, internal combustion engine, etc., high amount of heat is generated. This heat raises the temperature of the equipment and thereby results in the development of thermal load within the equipment. The presence of excessive thermal loading causes various types of material failures such as fatigue failure, creep failure, and crack propagation which reduce the life of these equipment. To avoid such excessive thermal shock, it is important to maintain the operating temperature within certain prescribed limits. There are several techniques to control the temperature of the equipment. Among them, one of the techniques is to increase the primary surface area of the equipment [1,2]. This extra surface area is called as fin or extended surface which works as a cooling agent to the primary surface. Fin transfers excess heat from the primary surface to the surroundings. An annular fin is more favorable to enhance the heat transfer rate as it provides more surface area to the adjacent coolant.
Inverse estimation of variable thermal parameters in a functionally graded annular fin using dragon fly optimization
Published in Inverse Problems in Science and Engineering, 2019
Ashis Mallick, Rajiv Ranjan, Dilip K. Prasad
Fins are extended surfaces used to transfer excess heat from a primary surface, such as on the equipment, to the surroundings for maintaining the operating temperature at the primary surface [1]. Fins enhance the heat transfer rate by providing an increased surface area to the adjacent coolant. They are used as cooling agents in a variety of equipment including internal combustion engines, compressors, heat exchangers, transformers, nuclear rods, space radiators, electronic devices. Among the various types of fins, annular fins are more popular and of current research interest because of their compact design. An annular fin provides more surface area in contact with the coolant as compared to a straight fin of comparable dimension. Due to the compact design and ease of manufacturing, annular fin with constant thickness is most favourable for use in tube heat exchangers.