Transient natural convection in horizontal cylinders with constant cooling rate

1976 ◽  
Vol 9 (4) ◽  
pp. 215-225 ◽  
Author(s):  
M. Takeuchi ◽  
K. C. Cheng
Keyword(s):  
Natural Convection ◽  
Cooling Rate ◽  
Transient Natural Convection ◽  
Horizontal Cylinders

Transient Natural Convection of Water in a Horizontal Pipe With Constant Cooling Rate Through 4°C

1976 ◽  
Vol 98 (4) ◽  
pp. 581-587 ◽  
Author(s):  
K. C. Cheng ◽  
M. Takeuchi
Keyword(s):  
Natural Convection ◽  
Transient Flow ◽  
Temperature Fields ◽  
Freezing Process ◽  
Horizontal Pipe ◽  
Transfer Rates ◽  
Transient Natural Convection ◽  
Anomalous Density ◽  
Horizontal Cylinders ◽  
Relationship Of

A theoretical analysis is carried out to study the influence of an anomalous density-temperature relationship of water on the transient natural convection in horizontal cylinders with wall temperature decreasing at a uniform rate. Numercial solutions are obtained for three cases involving different cooling rates, pipe diameters, and initial uniform water temperatures for temperature conditions between 0 and 7°C. The transient flow and temperature fields, and local and overall heat transfer rates are presented to study the inversion of flow patterns caused by the maximum density at 4°C. The numerical results are compared with the experimental measurements and predictions of a quasi-steady boundary-layer model reported by Gilpin [2], and generally a good agreement is observed. Some implications on the subsequent freezing process are pointed out.

Transient natural convection in a cylindrical annulus

10.2514/3.944 ◽  
1997 ◽  
Vol 11 ◽  
pp. 595-597
Author(s):  
Young-Kil Yu ◽  
Ruey-Hung Chen ◽  
Larry Chew ◽  
K. Ramamurthi ◽  
K. Ravi
Keyword(s):  
Natural Convection ◽  
Transient Natural Convection ◽  
Cylindrical Annulus
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