Chaotic heat transfer in a periodic two-dimensional flow

1998 ◽  
Vol 10 (8) ◽  
pp. 2102-2104 ◽  
Author(s):  
E. Saatdjian ◽  
J. C. Leprevost
Keyword(s):  
Heat Transfer ◽  
Two Dimensional ◽  
Dimensional Flow ◽  
Two Dimensional Flow

A numerical model on transient, two-dimensional flow and heat transfer in He II

Cryogenics ◽  
1997 ◽  
Vol 37 (1) ◽  
pp. 1-9 ◽  
Author(s):  
T. Kitamura ◽  
K. Shiramizu ◽  
N. Fujimoto ◽  
Y.F. Rao ◽  
K. Fukuda
Keyword(s):  
Heat Transfer ◽  
Numerical Model ◽  
Two Dimensional ◽  
Dimensional Flow ◽  
Flow And Heat Transfer ◽  
Two Dimensional Flow

Study of Two-Dimensional Flow-Boiling Morphological Characteristics in the Micro Gap With Surface Wettability on Hot Spot

2019 ◽  
Author(s):  
Anwarul Karim ◽  
Jong-Hoon Kim
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Flow Boiling ◽  
Hot Spot ◽  
Morphological Characteristics ◽  
Two Dimensional ◽  
Dimensional Flow ◽  
Wide Range ◽  
Two Dimensional Flow

Abstract Thermal management is one of the most challenging problems of electronic devices today. As technology becomes increasingly miniaturized, extremely localized heat dissipation leads to the challenge of keeping devices away from overheating. Flow-boiling microchannel heat-sinks exploit the highly efficient thermal energy transport of phase change from liquid to vapor. However, the excessive consumption of liquid-phase by highly localized heat source causes the two-phase flow maldistribution, leading to greatly reduced heat transfer coefficient, high-pressure loss, and limited flow rate. In this study, we investigate two-dimensional flow-boiling morphological characteristics in a microgap with hydrophilic coating on hot-spot. The experiments are carried out on a Stainless Steel plate having a micro gap depth of 254 μm using deionized water with inlet at room temperature. A partial hydrophilic surface is created on the hot-spot (surface above the heater) which forms a wettability difference along the metal plate. A wide range of mass flux and heat flux are considered to quantify heat transfer coefficient. In addition, high-speed flow visualizations are performed to characterize the nucleation and bubble dynamics in flow boiling.

Heat-Transfer Measurements in an Inexpensive Supersonic Wind Tunnel: 2—Results for a Laminar Boundary Layer Based on a Two-Dimensional Flow Model

1955 ◽  
Vol 22 (3) ◽  
pp. 297-304
Author(s):  
Joseph Kaye ◽  
G. A. Brown
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Supersonic Flow ◽  
Laminar Boundary Layer ◽  
Flow Model ◽  
Two Dimensional ◽  
Round Tube ◽  
One Dimensional ◽  
Dimensional Flow ◽  
Two Dimensional Flow

Abstract Reliable experimental data on local heat-transfer coefficients for supersonic flow of air in a round tube are reanalyzed in detail with the aid of an approximate two-dimensional flow model. The results are compared with similar results based on a one-dimensional flow model and with the theoretical predictions for supersonic flow over a flat plate and for flow in the entrance region of a tube when a laminar boundary layer is present. The two-dimensional flow model yields a better understanding of the phenomena which occur for diabatic supersonic flow of air in a round tube than that obtained with the aid of the one-dimensional flow model. The two-dimensional flow model shows that the core Mach number is nearly constant along the length of test section for a range of values of the inlet diameter Reynolds number. For a laminar boundary layer the values of the local Stanton number agree within a few per cent with the theoretical values for plate flow at the largest values of the inlet diameter Reynolds number.

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