Author
V.M.K. Sastri
Bio: V.M.K. Sastri is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Adiabatic process & Annulus (firestop). The author has an hindex of 1, co-authored 1 publications receiving 7 citations.
Topics: Adiabatic process, Annulus (firestop)
Papers
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TL;DR: In this article, a numerical study on two-dimensional freezing in an annulus made up of an initially superheated phase-change medium is presented, where numerical results are used to deduce a relation between the non-dimensional discharge time and the other parameters.
Abstract: An evaluation is made of the results of a numerical study on two-dimensional freezing in an annulus made up of an initially superheated phase-change medium. Numerical results are used to deduce a relation between the nondimensional discharge time and the other parameters. The velocity of the freeze front decreases with time because of the increase of interface area as the freezing proceeds radially outward, followed by a marginal decrease in the freezing rate due to the presence of the adiabatic surface; sensible cooling then occurs only where the freeze front has already reached the adiabatic surface. 6 refs.
7 citations
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TL;DR: In this paper, the authors presented the results of a numerical and experimental investigation realized on finned tubes with the objective of using them in thermal storage systems, based upon the pure conduction mechanism of heat transfer, the enthalpy formulation approach and the control volume method.
387 citations
TL;DR: In this article, the authors presented the results of a numerical study validated by experimental measurements on the solidification of PCM along a horizontal tube by using the boundary immobilization technique.
49 citations
TL;DR: In this article, the growth rate of ice on the outside of cooled copper tubes was studied and it was found that axial growth rate is distinct at low values of the coolant Reynolds number and short freezing times.
Abstract: The results of an experimental study are presented where the growth rate of ice on the outside of cooled copper tubes was studied. The tubes, which were immersed in water in an insulated vessel, were internally cooled by circulating glycol through them.
It was found that axial growth rate of ice is distinct at low values of the coolant Reynolds number and short freezing times. The slope of the ice thickness with axial distance showed moderate dependency on time but varied with coolant flow rate, and with Stanton and Biot numbers.
A key result from the experiments is the abrupt ice thickness enlargements on the surface of tube bends. This anomaly may be attributed to internal flow disturbances of the coolant, and creation of local eddies inside the bends that enhance growth of ice. The effect was evident for a low Reynolds number (Re = 251.9 and Bi < 1), and fades out for large Reynolds number flows.
44 citations
TL;DR: In this article, the authors present the results of a numerical parametric study of the solidification of a phase change material (PCM) around a cylinder carrying a heat transfer fluid (HTF) inside.
Abstract: This paper presents the results of a numerical parametric study of the solidification of a phase change material (PCM) around a cylinder carrying a heat-transfer fluid (HTF) inside. A pure conduction model is used for the PCM and tube wall, the finite volume method is used together with the interface immobilization technique for treating the phase-change process. The convection problem inside the tube is solved by an energy balance with a Nusselt number value, obtained from the steady-state values for constant wall heat-flux conditions. The effects of the HTF entry temperature, the initial PCM temperature and the thermal conductivity of the tube material on the evolution of the solidification front are studied. Results for the temperature distribution during the process, phase-change interface velocity and thermal energy stored in the system are also presented.
37 citations
TL;DR: In this article, a thermal numerical model for the solidification of phase change material around a radially finned tube with a constant wall temperature is presented, based upon a pure conduction formulation and the enthalpy method.
36 citations