Self-cleaning compact heat exchangers: The role of two-phase flow patterns in design and optimization

2019 ◽  
Vol 112 ◽  
pp. 1-12 ◽  
Author(s):  
Dario Maggiolo ◽  
Srdjan Sasic ◽  
Henrik Ström
Keyword(s):  
Heat Exchangers ◽  
Two Phase Flow ◽  
Flow Patterns ◽  
Phase Flow ◽  
Two Phase ◽  
Design And Optimization ◽  
Compact Heat Exchangers ◽  
Self Cleaning

Experiments on two-phase flow distribution inside parallel channels of compact heat exchangers

2008 ◽  
Vol 34 (2) ◽  
pp. 128-144 ◽  
Author(s):  
A. Marchitto ◽  
F. Devia ◽  
M. Fossa ◽  
G. Guglielmini ◽  
C. Schenone
Keyword(s):  
Heat Exchangers ◽  
Two Phase Flow ◽  
Flow Distribution ◽  
Phase Flow ◽  
Two Phase ◽  
Compact Heat Exchangers ◽  
Parallel Channels

scholarly journals Two-Phase Flow and Pressure Drop in Flow Passages of Compact Heat Exchangers

1992 ◽  
Author(s):  
M.W. Wambsganss ◽  
J.A. Jendrzejczyk ◽  
D.M. France
Keyword(s):  
Pressure Drop ◽  
Heat Exchangers ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Compact Heat Exchangers

Gas–liquid two-phase flow pattern analysis based on multiscale symbolic transfer entropy

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Chunling Fan ◽  
Jiangfan Qin ◽  
Qihua Fan ◽  
Chuntang Zhang
Keyword(s):  
Dynamic Characteristics ◽  
Two Phase Flow ◽  
Flow Patterns ◽  
Transfer Entropy ◽  
Phase Flow ◽  
Two Phase ◽  
Fast Calculation ◽  
Symbolic Transfer Entropy ◽  
Influence Of Noise

Abstract This paper presents a multiscale symbolic transfer entropy (MSTE) to extract the features of gas–liquid two-phase flow and distinguish flow patterns effectively. The role of the MSTE in typical chaotic time series is investigated. Then the characteristics of the flow patterns about three gas–liquid two-phase flows are analyzed from the perspective of causal analysis. The results show that the MSTE can identify different flow patterns and characterize the dynamic characteristics of flow patterns, providing a new method for identifying two-phase flow accurately. In addition, the MSTE reduces the influence of noise to a certain extent and preserves the dynamic characteristics based on simplifying the original sequence. Compared with traditional algorithm, the MSTE has fast calculation speed and anti-interference characteristics and can express the essential features well.

scholarly journals Two-Phase Flow Mass Transfer Analysis of Airlift Pump for Aquaculture Applications

Fluids ◽  
2021 ◽  
Vol 6 (6) ◽  
pp. 226
Author(s):  
Rashal Abed ◽  
Mohamed M. Hussein ◽  
Wael H. Ahmed ◽  
Sherif Abdou
Keyword(s):  
Mass Transfer ◽  
Oxygen Transfer ◽  
Transfer Rate ◽  
Two Phase Flow ◽  
Oxygen Transfer Rate ◽  
Flow Patterns ◽  
Oxygen Mass Transfer ◽  
Phase Flow ◽  
Two Phase ◽  
Airlift Pump

Airlift pumps can be used in the aquaculture industry to provide aeration while concurrently moving water utilizing the dynamics of two-phase flow in the pump riser. The oxygen mass transfer that occurs from the injected compressed air to the water in the aquaculture systems can be experimentally investigated to determine the pump aeration capabilities. The objective of this study is to evaluate the effects of various airflow rates as well as the injection methods on the oxygen transfer rate within a dual injector airlift pump system. Experiments were conducted using an airlift pump connected to a vertical pump riser within a recirculating system. Both two-phase flow patterns and the void fraction measurements were used to evaluate the dissolved oxygen mass transfer mechanism through the airlift pump. A dissolved oxygen (DO) sensor was used to determine the DO levels within the airlift pumping system at different operating conditions required by the pump. Flow visualization imaging and particle image velocimetry (PIV) measurements were performed in order to better understand the effects of the two-phase flow patterns on the aeration performance. It was found that the radial injection method reached the saturation point faster at lower airflow rates, whereas the axial method performed better as the airflow rates were increased. The standard oxygen transfer rate (SOTR) and standard aeration efficiency (SAE) were calculated and were found to strongly depend on the injection method as well as the two-phase flow patterns in the pump riser.

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