scholarly journals Numerical Study of Flow Separation and Pressure Drop for Flow Past Staggered Tube Bundles

2015 ◽  
Vol 773-774 ◽  
pp. 363-367
Author(s):  
Azmahani Sadikin ◽  
Norasikin Mat Isa
Keyword(s):  
Flow Separation ◽  
Single Phase ◽  
Numerical Study ◽  
Tube Bundle ◽  
Horizontal Tube ◽  
Diameter Ratio ◽  
Published Data ◽  
Single Phase Flow ◽  
Shell Side ◽  
Tube Bundles

The vertical single-phase flow was studied on the shell side of a horizontal tube bundle. In the present study, CFX version 14.0 from ANSYS was used to predict the flow regimes in the 19 mm diameter in staggered configuration with a pitch to diameter ratio of 1.32. The simulations were undertaken to inform on how the fluid flowed within the tube passages. The results show that the tube bundle arrangement in a heat exchanger does effect to the flow separation and re-attachment points. This is consistent with other published data.

Flow Separation Prediction in a Single-Phase Flow in an Inline Tube Bundles

2013 ◽  
Vol 465-466 ◽  
pp. 608-612 ◽  
Author(s):  
Azmahani Sadikin ◽  
Norasikin Mat Isa
Keyword(s):  
Flow Separation ◽  
Single Phase ◽  
Tube Bundle ◽  
Horizontal Tube ◽  
Published Data ◽  
Phase Flow ◽  
Single Phase Flow ◽  
Shell Side ◽  
Line Configuration ◽  
Tube Bundles

The vertical single-phase flow was studied on the shell side of a horizontal tube bundle. In the present study, CFX version 14.0 from ANSYS was used to predict the flow regimes in the two tube bundles; i.e. the 19 mm and 38 mm arranged in an in-line configuration with a pitch to diameter ratio of 1.32. The simulations were undertaken to inform on how the fluid flowed within the tube passages in different tube bundle diameter that gives different gaps between the tubes, where the fluid must pass. The results show that the maximum gaps between the tubes have no clear effect to the flow where the flow separation and re-attachment and the average velocity is the same when increasing the tube bundle. This is consistent with other published data.

Research on Two-Phase Flow Induced Vibration Characteristics of U-Tube Bundles

2017 ◽  
Author(s):  
Jiang Nai-bin ◽  
Gao Li-xia ◽  
Huang Xuan ◽  
Zang Feng-gang ◽  
Xiong Fu-rui
Keyword(s):  
Upper Bound ◽  
Single Phase ◽  
Two Phase Flow ◽  
Tube Bundle ◽  
Upper Bounds ◽  
Vibration Response ◽  
Phase Flow ◽  
Single Phase Flow ◽  
Two Phase ◽  
Tube Bundles

In steam generators and other heat exchangers, there are a lot of tube bundles subjected to two-phase cross-flow. The fluctuating pressure on tube bundle caused by turbulence can induce structural vibration. The experimental data from a U-tube bundle of steam generator in air-water flow loop are analyzed in this work. The different upper bounds of buffeting force are used to calculate the turbulence buffeting response of U-tubes, and the calculation results are compared with the experimental results. The upper bounds of buffeting force include one upper bound based on single-phase flow, and two upper bounds based on two-phase flow. It is shown that the upper bound based on single-phase flow seriously underestimated the turbulence excitation, the calculated vibration response is much less than the experimental measurement. On the other hand, the vibration response results calculated with the upper bounds based on two-phase flow are closer to the measured results under most circumstances.

Numerical study on single-phase flow of natural circulation under ocean condition using coupled relap5 system code and fluent code

2019 ◽  
Vol 343 ◽  
pp. 138-150 ◽  
Author(s):  
Lie Wei ◽  
Liang-Ming Pan ◽  
Hui He ◽  
De-Wen Yuan ◽  
Jian-Jun Xu ◽  
...  
Keyword(s):  
Single Phase ◽  
Numerical Study ◽  
Natural Circulation ◽  
Phase Flow ◽  
Single Phase Flow

Shell Side Single-Phase Experimental Heat Transfer Analysis of a Vertically Oriented Single Segmental Baffle Bundle With Dimpled Tubes

2019 ◽  
Vol 12 (1) ◽  
Author(s):  
Ahmad Abbas ◽  
Tauseef Ismail ◽  
Zahid Ayub ◽  
Adnan Ayub ◽  
Taqi Ahmad Cheema ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Nusselt Number ◽  
Single Phase ◽  
Tube Bundle ◽  
Method Comparison ◽  
Heat Transfer Analysis ◽  
Shell Side ◽  
Commercial Software ◽  
Experimental Heat ◽  
Shell And Tube

Abstract This paper presents single-phase shell side heat transfer performance of a vertically oriented shell and tube bundle. Steady-state single-phase experiments were conducted to determine the shell side Nusselt number with water and water/glycol solution as working fluids for both counter and parallel flow configurations. Experiments were carried out for Reynolds number varying from 3000 to 15,000 with Prandtl number ranging from 10 to 20. Counter flow configuration showed slightly better performance. Nusselt number correlations are presented for both configurations using a modified Wilson plot method. Comparison of results with previous studies and commercial software are presented. Thermal performance for all flow rate conditions showed close comparison to the results from a reputable commercial software. The correlation was further validated by comparing results for 30 different cases to calculations from 2 widely used commercial softwares. Comparison showed that the correlation can be used for the design of single-phase single segmental shell and tube heat exchangers.

Experimental and Computational Analysis of Single Phase Flow Coiled Flow Inverter Focusing on Number of Transfer Units and Effectiveness

2016 ◽  
Vol 14 (6) ◽  
pp. 1225-1233
Author(s):  
Thomas Barthram ◽  
Carlos I. Rivera-Solorio
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Single Phase ◽  
Parallel Flow ◽  
Process Conditions ◽  
Phase Flow ◽  
Single Phase Flow ◽  
Shell Side ◽  
Tube Heat Exchanger ◽  
Side Flow

Abstract The coiled flow inverter (CFI) is an enhanced heat exchanger. This device uses the principle of flow inversion to increase heat transfer and has potential for industrial applications. A mathematical model based on experimental and numerical data was developed for the case of single phase flow with water as working fluids. This model includes (ε-NTU) Effectiveness Number of Transfer Units curves, Nusselt correlations, for this specific neither parallel nor counter flow setup. A range of Reynolds numbers from 2,000 to 18,000 in the tube side, and 500 to 2,000 in the shell side was considered. The coiled flow inverter is made of coils and 90◦ bends, inserted in a closed shell. The shell side is cylindrical. The average temperatures at input and output of the heat exchanger were reported for different tube and shell side flow rates. Overall heat-transfer coefficients (Uf) were calculated as well as the Number of Transfer Units (NTU) and Effectiveness (ε) at various process conditions. A Nusselt correlation was proposed for the shell side of this configuration. The ε-NTU curves of the selected heat exchanger have a high resemblance to the parallel flow tube heat exchanger, with a maximum of 2.1 % error. The coiled flow inverter has increases of 200 %, 300 % and 500 %, respectively for effectiveness, number of transfer units and overall heat transfer coefficient compared to a regular parallel flow heat exchanger at the same conditions. Correlations for the CFI in its shell were proposed. This heat exchanger provides higher Uf, reduces cumbersomeness and length of piping.

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