Two-phase flow regimes during the rewetting and refilling of hot horizontal tubes

Abdul-Razzak, A.; Shoukri, M.; Chan, A. M. C.

doi:10.1016/0894-1777(90)90008-u

Cited by 3 publications

(3 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the stratified flow pattern is used as the basis for model development. This is supported by the experimental work, reported by Abdul-Razzak et al (1990a, 1990b, which showed that the stratified flow pattern is the most common flow pattern during refilling and rewetting of hot horizontal tubes as shown in Figure 1. However, other flow regimes observed experimentally such as the inverted annular flow are treated herein as a further development from stratified flow.…”

Section: Simplified Two-fluid Model For the Refilling And Rewetting Osupporting

confidence: 77%

See 1 more Smart Citation

Two-fluid modelling of the rewetting and refilling of hot horizontal tubes

1993

Self Cite

View full text Add to dashboard Cite

This paper deals with the use of a two‐fluid model for predicting the thermal‐hydraulic characteristics of the rewetting and refilling of hot horizontal tubes. The two‐fluid model equations were simplified and solved using an explicit finite difference scheme. A set of constitutive equations is used for closure. A new film boiling model and a model for evaluating the rate of latent to total heat in film boiling were incorporated in the two‐fluid model. A newly proposed rewetting criterion, based on vapour film collapse, was used to mark the end of the film boiling regime. The model is capable of predicting the rewetting and refilling process in horizontal tubes under conditions of stratified or inverted annular refilling flow. The model predictions were found to be in good agreement with the experimental results.

show abstract

Section: Simplified Two-fluid Model For the Refilling And Rewetting Osupporting

confidence: 77%

“…iv -The present model is applied to both stratified and inverted annular flow which were found to exist during the rewetting and refilling of hot tubes under certain conditions as demonstrated by Abdul-Razzak et al (1990b).…”

mentioning

confidence: 99%

Two-fluid modelling of the rewetting and refilling of hot horizontal tubes

1993

Self Cite

View full text Add to dashboard Cite

show abstract

“…Where, G is the mass flux, 𝜌 𝑔 is the vapor density, 𝜌 𝑙 is the liquid density of the refrigerant, and α is the void fraction which is calculated from Abdul-Razzak et al correlation [11]: 𝛼 = (1 + 0.49 𝜒 𝑡𝑡 0.3036 ) −1 (3) Where, the Martinelli parameter 𝜒 𝑡𝑡 is expressed as the following equation:…”

Section: Data Reductionmentioning

confidence: 99%

Condensation of R-134a inside the Vertical Smooth and Dimpled Helically Coiled Tubes

Kumar,

Solanki

2023

Proceedings of the 9th World Congress on Mechanical, Chemical, and Material Engineering

View full text Add to dashboard Cite

An experimental study has been carried out to study the frictional pressure drops during condensation of R-134a vapours while flowing inside the vertically positioned smooth and dimpled helically coiled tubes. The tests were conducted at the mass flux of 115 to 190 kg.m -2 .s -1 . The saturation temperature of the R-134a condensing vapour remained 35 o C. The effect of the mass flux and vapour quality on frictional pressure drops was investigated. In addition, a comparison has also been made for the frictional pressure drop between the vertical smooth helically coiled tube and the dimpled helically coiled tube. The experimental results showed that for the same mass flux, the dimpled helical coiled tube has a higher frictional pressure drop compared to the smooth helically coiled tube. Moreover, a comparison of the experimental frictional pressure drop data for vertical smooth helically coiled tubes with that of renowned correlations has also been made. The correlations predicted the experimental data in an error band of ± 30%.

show abstract