Research on the heat and mass transfer mechanisms for growth of hydrate shell from gas bubbles

2019 ◽  
Vol 97 (6) ◽  
pp. 1953-1960 ◽  
Author(s):  
Xiaohui Sun ◽  
Andi Xia ◽  
Baojiang Sun ◽  
Youqiang Liao ◽  
Zhiyuan Wang ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Gas Bubbles ◽  
Hydrate Shell ◽  
Transfer Mechanisms

An insight into the heat and mass transfer mechanisms of eggshells hatching broiler chicks and its effects to the hatcher environment

2015 ◽  
Vol 48 ◽  
pp. 69-76 ◽  
Author(s):  
C.E.B. Romanini ◽  
V. Exadaktylos ◽  
S.W. Hong ◽  
Q. Tong ◽  
I. McGonnell ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Broiler Chicks ◽  
Transfer Mechanisms ◽  
Insight Into

Research Dispersing Liquid and Gas in the Contact Device with an Increased Range of Stable Operation

2017 ◽  
Vol 21 (3) ◽  
pp. 12-15 ◽  
Author(s):  
A.V. Dmitriev ◽  
I.N. Madyshev ◽  
O.S. Dmitrieva ◽  
A.N. Nikolaev
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Distinctive Feature ◽  
Experimental Studies ◽  
Gas Bubbles ◽  
Contact Device ◽  
Stable Operation ◽  
Contact Devices ◽  
Transfer Apparatus ◽  
Axisymmetric Perturbations

To increase the efficiency of mass-transfer apparatus, a jet-bubbling contact device is suggested. The article considers perspectives for using of jet-bubble contact devices for heat and mass transfer apparatus. The distinctive feature of the developed device is an intensive countercurrent contact between the gas (vapor) and liquid in each element. The authors conducted experimental studies of dispersing liquid and gas in the proposed contact devices. Powerful turbulent axisymmetric perturbations occur in the bubbling layer, which affect the initial oscillations of the jet and determine the length of its decay. In the jets larger diameter distances between the involved gas bubbles less. Therefore, the resulting local jet are usually a smaller amount of liquid, which is decomposed accordingly into smaller drops.

Validation of a CFD Condensation Model Based on Heat and Mass Transfer Analogy by TOSQAN Facility ISP47 Test

2006 ◽  
Author(s):  
Matteo Bucci ◽  
Walter Ambrosini ◽  
Nicola Forgione ◽  
Francesco Oriolo ◽  
Sandro Paci
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Nuclear Reactor ◽  
Momentum Balance ◽  
Average Temperature ◽  
Standard Problem ◽  
Computational Fluid Dynamics Analysis ◽  
Energy And Momentum ◽  
Transfer Mechanisms ◽  
Good Agreement

The content of this paper is focused on a computational fluid dynamics analysis of the test performed within the facility TOSQAN as a part of the International Standard Problem 47 (ISP 47). The aim of the study is to contribute to the understanding of the heat and mass transfer mechanisms and to check the possibility to use a commercial CFD code for simulating the mass transfer phenomena of interest in nuclear reactor containment design and safety analysis. In this aim, the FLUENT 6.2 code has been used. The effect of the condensation rate onto the vessel walls was simulated by appropriate source terms introduced by user-defined subroutines into the mass, energy and momentum balance equations. In the paper the time trends of the average temperature and pressure of the atmosphere inside the TOSQAN vessel have been compared with the available experimental data, obtaining a good agreement. Spatial profiles have been also analysed and compared with the experimental ones for the main physical variables in the first, second and fourth steady-state phases which the test consists of.

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