Air adsorption on the gas-liquid interface in vapor condensation across horizontal tube

2018 ◽  
Vol 129 ◽  
pp. 564-572 ◽  
Author(s):  
J.X. Zhang
Keyword(s):  
Horizontal Tube ◽  
Vapor Condensation ◽  
Liquid Interface

Analysis of Two-Phase, One-Component Stratified Flow With Condensation

1966 ◽  
Vol 88 (3) ◽  
pp. 265-272 ◽  
Author(s):  
C. E. Rufer ◽  
S. P. Kezios
Keyword(s):  
Horizontal Tube ◽  
Liquid Interface ◽  
Film Condensation ◽  
Bulk Liquid ◽  
Tube Radius ◽  
Two Phase ◽  
Laminar Film Condensation ◽  
Level Data ◽  
Energy And Momentum ◽  
Special Case

A physical model is constructed for the stratified two-phase flow pattern with annular, laminar film condensation superimposed and the equivalent mathematical model is analyzed. Utilizing the principle of conservation of mass, energy, and momentum, an equation is derived which gives the slope of the vapor-bulk liquid interface along the tube. By varying the flow rate, inclination of the tube, tube radius, and film temperature difference, the effect of these variables on the flow level is illustrated in a typical example. A special case of this equation, namely, that describing the vapor-liquid interface when the rate of condensation is zero, is compared with several recent empirical horizontal tube holdup correlations and with flow-level data of Gazley for stratified air-water flow.

scholarly journals Behavior of the Gas-liquid Interface in a Horizontal Tube after the Step Change of Air Flow

1986 ◽  
Vol 29 (258) ◽  
pp. 4241-4246
Author(s):  
Shizuo SAITOH ◽  
Noriyuki MAEKAWA ◽  
Eiji HIHARA ◽  
Takamoto SAITOH
Keyword(s):  
Air Flow ◽  
Horizontal Tube ◽  
Step Change ◽  
Liquid Interface

scholarly journals Behavior of the gas-liquid interface in a horizontal tube after the step change of air flow.

1986 ◽  
Vol 52 (476) ◽  
pp. 1872-1877
Author(s):  
Shizuo SAITOH ◽  
Noriyuki MAEKAWA ◽  
Eiji HIHARA ◽  
Takamoto SAITOH
Keyword(s):  
Air Flow ◽  
Horizontal Tube ◽  
Step Change ◽  
Liquid Interface

Theoretical Modeling of Vapor Condensation in the Presence of Noncondensable Gas on a Horizontal Tube

2019 ◽  
Vol 141 (12) ◽  
Author(s):  
Junhui Lu ◽  
Haishan Cao ◽  
JunMing Li
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Liquid Film ◽  
Mass Flux ◽  
Horizontal Tube ◽  
Vapor Condensation ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Noncondensable Gas ◽  
Mass Fluxes

Abstract Double-boundary layer theory was adopted to investigate the distributions of the liquid film, gas film, heat transfer coefficient, and condensate mass fluxes around a horizontal tube for vapor condensation with noncondensable gases like steam–air and steam–CO2 mixtures under free convection. The investigation considered the effects of the noncondensable gas concentration, surface subcooling temperature, and pressure. The thicknesses of the liquid and gas films increase gradually along the wall from top to bottom, whereas the local heat transfer coefficient and the condensate mass flux decrease. The film thicknesses do not change significantly around the upper part of the tube but increase sharply around the lower part. The liquid film thicknesses, gas film thicknesses, condensate mass fluxes, and heat transfer coefficients of steam–air systems are compared with those of steam–CO2 systems. The condensate mass flux in the steam–air system is smaller than that of steam–CO2 system under the condition of the same surface subcooling and gas mass fraction because air has more moles of molecules in the mixture than CO2 and the steam more easily diffuses through CO2 than through air. The predicted average condensation heat transfer coefficients agree well with the available experimental data.

TEM study of amorphization of Cu and Ti foils by cold-rolling

1990 ◽  
Vol 48 (4) ◽  
pp. 146-147
Author(s):  
W. A. Chiou ◽  
N. L. Jeon ◽  
Genbao Xu ◽  
M. Meshii
Keyword(s):  
Solid State ◽  
Cold Rolling ◽  
High Energy ◽  
Rapid Quenching ◽  
Vapor Condensation ◽  
Metallic Alloys ◽  
Solid State Reactions ◽  
High Energy Particle ◽  
Amorphous Metallic Alloys ◽  
Thin Foils

For many years amorphous metallic alloys have been prepared by rapid quenching techniques such as vapor condensation or melt quenching. Recently, solid-state reactions have shown to be an alternative for synthesizing amorphous metallic alloys. While solid-state amorphization by ball milling and high energy particle irradiation have been investigated extensively, the growth of amorphous phase by cold-rolling has been limited. This paper presents a morphological and structural study of amorphization of Cu and Ti foils by rolling.Samples of high purity Cu (99.999%) and Ti (99.99%) foils with a thickness of 0.025 mm were used as starting materials. These thin foils were cut to 5 cm (w) × 10 cm (1), and the surface was cleaned with acetone. A total of twenty alternatively stacked Cu and Ti foils were then rolled. Composite layers following each rolling pass were cleaned with acetone, cut into half and stacked together, and then rolled again.

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