Droplet deposition and momentum transfer in annular flow

AIChE Journal ◽  
1995 ◽  
Vol 41 (9) ◽  
pp. 2040-2046 ◽  
Author(s):  
Larry B. Fore ◽  
Abraham E. Dukler
Keyword(s):  
Momentum Transfer ◽  
Annular Flow ◽  
Droplet Deposition

F213 Effects of mixing vane attached to grid spacer on droplet deposition in gas-liquid two-phase annular flow

2015 ◽  
Vol 2015.20 (0) ◽  
pp. 369-370
Author(s):  
Masato ENDO ◽  
Wataru TAKAKI ◽  
Yudai HIRAKATA ◽  
Akimaro KAWAHARA ◽  
Michio SADATOMI
Keyword(s):  
Annular Flow ◽  
Droplet Deposition ◽  
Two Phase

Rate of droplet deposition in steam–water annular flow and effect of a flow obstacle

2011 ◽  
Vol 241 (11) ◽  
pp. 4497-4503 ◽  
Author(s):  
Tomio Okawa ◽  
Toshihiro Murakami ◽  
Rei Takei
Keyword(s):  
Annular Flow ◽  
Droplet Deposition

Mechanistic Prediction of Dryout Heat Flux in Annular Two-Phase Flow

2002 ◽  
Author(s):  
Tomio Okawa ◽  
Saeyun Kim ◽  
Isao Kataoka ◽  
Masanori Naitoh
Keyword(s):  
Heat Flux ◽  
Critical Heat Flux ◽  
Annular Flow ◽  
Density Ratio ◽  
Droplet Deposition ◽  
Simple Correlation ◽  
Two Phase ◽  
Transition Length ◽  
The Mean ◽  
Liquid Film Dryout

Incorporating the recently developed correlations for the rates of droplet deposition and entrainment with the film flow model, critical heat flux due to liquid film dryout in steam-water annular flow was predicted. In the present calculations, the predicted critical heat flux is affected not only by the deposition and entrainment rates but also by the entrainment fraction at the transition to annular flow (Transition quality was estimated by Wallis’s correlation). For this reason, the entrainment fraction at the transition was correlated in terms of dimensionless transition length to annular flow and density ratio. A simple correlation for the occurrence of dryout was also proposed. It was demonstrated by numerical simulations that the present method is to predict the available 1,340 data of dryout heat flux with the mean square relative error of 0.068.

New Models of Droplet Deposition and Entrainment for Prediction of Dryout in Uniform and Non-Uniform Heated Annuli

2016 ◽  
Author(s):  
H. B. Zhang ◽  
G. F. Hewitt
Keyword(s):  
Experimental Data ◽  
Annular Flow ◽  
Present Model ◽  
Droplet Deposition ◽  
Phenomenological Modeling ◽  
New Models ◽  
Axial Heat ◽  
Vertical Annuli ◽  
Vertical Tubes ◽  
Unilateral Heating

In this paper, we present a phenomenological modeling of annular flow for dryout prediction in vertical annuli by adopting a new set of correlations of droplet deposition and entrainment. The performance of the new correlations is tested by using the experimental data of Becker and Letzter [1] measured in a 3000mm annulus under bilateral as well as unilateral heating conditions, and the experimental data of Becker et al. [2] obtained in a 3650mm long annulus in respect of eight different axial heat flux profiles. The applicability of two widely used correlations of droplet deposition and entrainment in annuli which were derived from flows in vertical tubes was also checked. It was shown that large discrepancies were observed for the tube-based correlations, while for our present model the predicted CHFs as well as the positions of dryout occurrence in the case of non-uniformly heated annuli agree well with the experimental data.

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