Analytic modeling and large-scale experimental study of mass and heat transfer during hydrate dissociation in sediment with different dissociation methods

Energy ◽  
2015 ◽  
Vol 90 ◽  
pp. 1931-1948 ◽  
Author(s):  
Yi Wang ◽  
Jing-Chun Feng ◽  
Xiao-Sen Li ◽  
Yu Zhang ◽  
Gang Li
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Large Scale ◽  
Hydrate Dissociation ◽  
Analytic Modeling ◽  
Mass And Heat Transfer

Modelling of hydrate dissociation in multiphase flow considering particle behaviors, mass and heat transfer

Fuel ◽  
2021 ◽  
Vol 306 ◽  
pp. 121655
Author(s):  
Xuewen Cao ◽  
Kairan Yang ◽  
Hongchao Wang ◽  
Jiang Bian
Keyword(s):  
Heat Transfer ◽  
Multiphase Flow ◽  
Hydrate Dissociation ◽  
Mass And Heat Transfer

An Experimental Study of Heat Transfer in a Large-Scale Turbine Rotor Passage

1992 ◽  
Author(s):  
Michael F. Blair
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Large Scale ◽  
Leading Edge ◽  
High Heat ◽  
Turbine Rotor ◽  
Secondary Flows ◽  
Suction Surface ◽  
Tip Leakage ◽  
High Heat Transfer

An experimental study of the heat transfer distribution in a turbine rotor passage was conducted in a large–scale, ambient temperature, rotating turbine model. Meat transfer was measured for both the full–span suction and pressure surfaces of the airfoil as well as for the hub endwall surface. The objective of this program was to document the effects of flow three–dimensionality on the heat transfer in a rotating blade row (vs. a stationary cascade). Of particular interest were the effects of the hub and tip secondary flows, tip leakage and the leading–edge horseshoe vortexsystem. The effect of surface roughness on the passage heat transfer was also investigated. Midspan results are compared with both smooth–wall and rough–wall finite–difference two dimensional heat transfer predictions. Contour maps of Stanton number for both the rotor airfoil and endwall surfaces revealed numerous regions of high heat transfer produced by the three dimensional flows within the rotor passage. Of particular importance are regions of local enhancement (as much as 100% over midspan values) produced on the airfoil suction surface by the secondary flows and tip–leakage vortices and on the hub endwall by the leading–edge horseshoe vortex system.

An Experimental Study Heat Transfer in a Large-Scale Turbine Rotor Passage

1994 ◽  
Vol 116 (1) ◽  
pp. 1-13 ◽  
Author(s):  
M. F. Blair
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Large Scale ◽  
Leading Edge ◽  
Horseshoe Vortex ◽  
Turbine Rotor ◽  
Secondary Flows ◽  
Vortex System ◽  
Tip Leakage ◽  
High Heat Transfer

An experimental study of the heat transfer distribution in a turbine rotor passage was conducted in a large-scale, ambient temperature, rotating turbine model. Heat transfer was measured for both the full-span suction and pressure surfaces of the airfoil and for the hub endwall surface. The objective of this program was to document the effects of flow three dimensionality on the heat transfer in a rotating blade row (versus a stationary cascade). Of particular interest were the effects of the hub and tip secondary flows, tip leakage, and the leading-edge horseshoe vortex system. The effect of surface roughness on the passage heat transfer was also investigated. Midspan results are compared with both smooth-wall and rough-wall finite-difference two-dimensional heat transfer predictions. Contour maps of Stanton number for both the rotor airfoil and endwall surfaces revealed numerous regions of high heat transfer produced by the three-dimensional flows within the rotor passage. Of particular importance are regions of local enhancement (as much as 100 percent over midspan values) produced on the airfoil suction surface by the secondary flows and tip-leakage vortices and on the hub endwall by the leading edge horseshoe vortex system.

Heat Transfer from Aluminum to He II—Application to Superconductive Magnetic Energy Storage

1979 ◽  
Vol 101 (2) ◽  
pp. 371-375 ◽  
Author(s):  
S. W. Van Sciver ◽  
R. W. Boom
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Heat Flux ◽  
Energy Storage ◽  
Large Scale ◽  
Magnetic Energy ◽  
Maximum Heat ◽  
Design Elements ◽  
Design Values ◽  
Magnetic Energy Storage

Heat transfer problems associated with large scale Superconductive Magnetic Energy Storage (SMES) are unique due to the proposed size of a unit. The Wisconsin design consists of a cryogenically stable magnet cooled with He II at 1.8 K. The special properties of He II (T <2.17 K) provide an excellent heat transfer medium for magnet stability. Design values are determined from an experimental study of heat transfer from aluminum to He II. Under near saturated conditions we observe a maximum surface heat flux of 1.7 W/cm2 at 1.91 K and a recovery at 0.7 W/cm2. The advantages of operating the magnet under subcooled conditions are exemplified by improved heat transfer. The maximum at 1.89 K and 1.3 atm pressure is 2.3 W/cm2 with recovery enhanced to 1.9 W/cm2. A conservative maximum heat flux of 0.5 W/cm2 with an associated temperature difference of 0.5 K has been chosen for design. Elements of the experimental study as well as the design will be discussed.

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