Methode zur schwingungssicheren Auslegung von federbelasteten Vollhubsicherheitsventilen mit Zu- und Ableitung

Friedel, L.; Cremers, J.; Pallaks, Bernhard

doi:10.1002/1522-2640(200009)72:9<1012::aid-cite10120>3.0.co;2-6

Cited by 2 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Summaries of models for the frictional pressure drop in twophase gas-liquid flow can be found in the books of, e.g., Chisholm [10], Mayinger [11], and Whalley [12]. An extensive collection of models and experiments about two-phase flow in pipes was already done by Friedel [1]. There is a good more recent literature survey by Spedding et al [2] with indication of the range of test conditions of the numerous authors as well as experiments and models for vertical two-phase flow.…”

Section: Two-phase Flowmentioning

confidence: 99%

“…So far, models in the literature were tested only in experiments with water (dynamic viscosity m L 1) = 0.001 Pa s) or liquids with viscosities lower than 0.05 Pa s, e.g., by Friedel [1] and Spedding et al [2]. The fluids in the examples given above, however, can have viscosities of up to 100 Pa s. For this reason, experiments in a vertical pipe of D = 54.5 mm inner diameter were performed with nitrogen and aqueous Luviskol (polyvinylpyrrolidone, PVP) solutions as model fluids with viscosities of up to 7 Pa s.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Pressure Drop in Emergency Vent Lines with Two‐Phase Flow of Gas and Viscous Liquid

Schmidt¹,

Giesbrecht²

2018

Chem Eng & Technol

View full text Add to dashboard Cite

It was investigated if empirical models from the literature are capable to predict the two‐phase pressure drop with highly viscous liquids in vent lines behind polymerization reactors or for production applications. The experiments were performed with upward pipe flow of nitrogen and water‐Luviskol® solutions with varying dynamic viscosities. By measuring the difference of the static pressure in a vertical pipe across a test section, the gradient of the friction pressure was determined. The frictional pressure gradients show some unexpected scatter and even negative gradients were found in case of slug flow. A comparison with eight models shows for three of them a sufficient accuracy for the measured two‐phase flow data with highly viscous liquids if the empirical parameters in the models are adapted to the new measurements.

show abstract

Section: Two-phase Flowmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%