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Research Papers: Flows in Complex Systems

Numerical Investigation of Air/Water and Hydrogen/Diesel Flow Across Tube Bundles With Baffles

[+] Author and Article Information
Diego N. Venturi

Department of Chemical Engineering,
University of Blumenau,
Blumenau 89030-000, SC, Brazil
e-mail: diegoventuri@gmail.com

Waldir P. Martignoni

Petrobras,
UN-SIX/PR/PQ,
São Mateus do Sul 83900-000, PR, Brazil

Dirceu Noriler

Department of Chemical Engineering,
University of Blumenau,
Blumenau 89030-000, SC, Brazil

Henry F. Meier

Department of Chemical Engineering,
University of Blumenau,
Blumenau 89030-000, SC, Brazil
e-mail: meier@furb.br

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received October 14, 2016; final manuscript received March 20, 2017; published online June 20, 2017. Assoc. Editor: Shizhi Qian.

J. Fluids Eng 139(9), 091103 (Jun 20, 2017) (9 pages) Paper No: FE-16-1676; doi: 10.1115/1.4036444 History: Received October 14, 2016; Revised March 20, 2017

Two-phase flows across tube bundles are very commonly found in industrial heat exchange equipment such as shell and tube heat exchangers. However, recent studies published in the literature are generally performed on devices where the flow crosses the tube bundle in only a vertical or horizontal direction, lacking geometrical fidelity with industrial models, and the majority of them use air and water as the working fluids. Also, currently, experimental approaches and simulations are based on very simplified models. This paper reports the simulation of a laboratory full-scale tube bundle with a combination of vertical and horizontal flows and with two different baffle configurations. Also, it presents a similarity analysis to evaluate the influence of changing the fluids to hydrogen and diesel in the operational conditions of the hydrotreating. The volume of fluid (VOF) approach is used as the interface phenomena are very important. The air/water simulations show good agreement with classical correlations and are able to show the stratified behavior of the flow in the horizontal regions and the intermittent flow in the vertical regions. Also, the two baffle configurations are compared in terms of volume fraction and streamlines. When dealing with hydrogen/diesel flow using correlations and maps made for air/water, superficial velocity is recommended as similarity variable when a better prediction of the pressure drop is needed, and the modified superficial velocity is recommended for prediction of the volume-average void fraction and the outlet superficial void fraction.

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Figures

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Fig. 1

Details of the tube bundle geometry and the differences in baffle configurations of the geometries. Geometric relations are B = 300 mm, d = 24.2 mm, H1 = 100 mm, H2 = 90 mm, L = 330 mm, Lt = 1300 mm, and p = 40 mm.

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Fig. 2

Grid used for the simulation of the tube bundle flow: (upper) detail of the face elements and (lower) stretching of the elements in the main flow direction

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Fig. 3

Time-series for the volume-average void fraction in case2

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Fig. 4

Time series of response variables in case 2: (a) pressure drop, (b) outlet superficial void fraction, (c) outlet air mass flow rate, and (d) outlet water mass flow rate

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Fig. 5

Liquid volume fraction contour map in a central plane across the domain: (a) case 1 and (b) case 2

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Fig. 6

Streamlines and velocity maps for cases 1 and 2 in two planes: (a) 12.5 mm and (b) 150 mm above the longitudinal baffle

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Fig. 7

Mean and RMS liquid volume fraction in the central plane of the tube bundle

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