Experiments on Melting of Unfixed Ice in a Horizontal Cylindrical Capsule

1987 ◽  
Vol 109 (2) ◽  
pp. 454-459 ◽  
Author(s):  
B. W. Webb ◽  
M. K. Moallemi ◽  
R. Viskanta
Keyword(s):  
Natural Convection ◽  
Flow Structure ◽  
Close Contact ◽  
Flow Regimes ◽  
Melting Process ◽  
Contact Melting ◽  
Cylinder Wall ◽  
Liquid Region ◽  
Inversion Point ◽  
Heated Cylinder

Melting of unrestrained ice in a horizontal cylindrical capsule has been investigated experimentally to determine the interaction of fluid flow induced by motion of the solid and natural convection with density inversion of the water–ice system. During the melting process the ice is drawn by buoyancy to the top of the heated cylinder where close-contact melting occurs. Natural convection-dominated melting whose intensity depends on wall temperature prevails in the liquid region below. Three distinct flow regimes were identified for the cylinder wall temperatures of 3.5, 7, and 12° C studied. The flow structure for temperatures below the inversion point is similar to that for melting of unfixed n-heptadecane reported previously. Photographs of flow regimes are presented, and dependence of the solid–liquid interface morphology on the flow structure is discussed.

scholarly journals Numerical Investigation on the Evolution of Thin Liquid Layer and Dynamic Behavior of an Electro-Thermal Drilling Probe during Close-Contact Heat Transfer

2021 ◽  
Vol 11 (8) ◽  
pp. 3443
Author(s):  
Chan Ho Jeong ◽  
Kwangu Kang ◽  
Ui-Joon Park ◽  
Hyung Ju Lee ◽  
Hong Seok Kim ◽  
...  
Keyword(s):  
Liquid Layer ◽  
Close Contact ◽  
Melting Process ◽  
Transient Behavior ◽  
Liquid Films ◽  
Melting Rate ◽  
Contact Melting ◽  
Contact Heat ◽  
Navier Stokes Equation ◽  
Thermal Drilling

This study investigates the transient behavior of an electro-thermal drilling probe (ETDP) during a close-contact melting process within a glacier. In particular, the present work analyzes the effect of the tip temperature on the formation of molten thin liquid films and the subsequent rate of penetration (ROP) through numerical simulation. We used the commercial code of ANSYS Fluent (v.17.2) to solve the Reynolds-averaged Navier–Stokes equation, together with an energy equation considering the solidification and melting model. The ROP of the drilling probe is determined based on the energy balance between the heating power and melting rate of ice. As the results, the ETDP penetrates the ice through a close-contact melting process. The molten liquid layer with less than 1 mm of thickness forms near the heated probe tip. In addition, the ROP increases with the heated temperature of the probe tip.

Close-Contact Melting Inside an Elliptical Cylinder

2000 ◽  
Vol 122 (4) ◽  
pp. 192-195 ◽  
Author(s):  
Sergei A. Fomin ◽  
Alexander V. Wilchinsky ◽  
Takeo S. Saitoh
Keyword(s):  
Mathematical Model ◽  
Thermal Energy ◽  
Close Contact ◽  
Energy Systems ◽  
Elliptic Cylinder ◽  
Melting Process ◽  
Melting Rate ◽  
Contact Melting ◽  
Approximate Mathematical Model ◽  
Characteristic Scales

An approximate mathematical model of contact melting in a horizontal elliptic cylinder is developed. The main characteristic scales and nondimensional parameters that describe the principal features of the melting process are found. It is shown that melting rate depends on the shape of the capsule. This is especially important for the design of practical latent heat thermal energy systems. [S0199-6231(00)00504-9]

Influence of dome shape on flow structure, natural convection and entropy generation in enclosures at different inclinations: A comparative study

2021 ◽  
Vol 197 ◽  
pp. 106321
Author(s):  
Çağatay Yıldız ◽  
Alp Eren Yıldız ◽  
Müslüm Arıcı ◽  
Nabeeha Amatullah Azmi ◽  
Amin Shahsavar
Keyword(s):  
Natural Convection ◽  
Comparative Study ◽  
Flow Structure ◽  
Entropy Generation ◽  
Dome Shape

Natural Convection in a Horizontal Cavity Partially Occupied by a Porous Media Saturated by a Coolant Liquid

2006 ◽  
Author(s):  
Fakhreddine S. Oueslati ◽  
Rachid Bennacer ◽  
Habib Sammouda ◽  
Ali Belghith
Keyword(s):  
Heat Transfer ◽  
Porous Media ◽  
Natural Convection ◽  
Flow Structure ◽  
Boussinesq Approximation ◽  
Density Variation ◽  
Heat Fluxes ◽  
Complex Flow ◽  
Coupled Equations ◽  
Complex Flow Structure

The natural convection is studied in a cavity witch the lower half is filled with a porous media that is saturated with a first fluid (liquid), and the upper is filled with a second fluid (gas). The horizontal borders are heated and cooled by uniform heat fluxes and vertical ones are adiabatic. The formulation of the problem is based on the Darcy-Brinkman model. The density variation is taken into account by the Boussinesq approximation. The system of the coupled equations is resolved by the classic finite volume method. The numerical results show that the variation of the conductivity of the porous media influences strongly the flow structure and the heat transfer as well as in upper that in the lower zones. The effect of conductivity is conditioned by the porosity which plays a very significant roll on the heat transfer. The structures of this flow show that this kind of problem with specific boundary conditions generates a complex flow structure of several contra-rotating two to two cells, in the upper half of the cavity.

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