Axial dispersion and pressure drop for single-phase flow in annular pulsed disc and doughnut columns: A CFD study

2018 ◽  
Vol 106 ◽  
pp. 335-344 ◽  
Author(s):  
Sourav Sarkar ◽  
K.K. Singh ◽  
K.T. Shenoy
Keyword(s):  
Pressure Drop ◽  
Single Phase ◽  
Axial Dispersion ◽  
Phase Flow ◽  
Single Phase Flow

Two-Phase Flow Behavior in Channels With Sudden Area Change Using Experimental and Computational Approach

2017 ◽  
Author(s):  
Ashish Kotwal ◽  
Che-Hao Yang ◽  
Clement Tang
Keyword(s):  
Experimental Data ◽  
Pressure Drop ◽  
Experimental Analysis ◽  
Single Phase ◽  
Computational Analysis ◽  
Phase Flow ◽  
Single Phase Flow ◽  
Two Phase ◽  
Flow Rates ◽  
Area Change

The current study shows computational and experimental analysis of multiphase flows (gas-liquid two-phase flow) in channels with sudden area change. Four test sections used for sudden contraction and expansion of area in experiments and computational analysis. These are 0.5–0.375, 0.5–0.315, 0.5–0.19, 0.5–0.14, inversely true for expansion channels. Liquid Flow rates ranging from 0.005 kg/s to 0.03 kg/s employed, while gas flow rates ranging from 0.00049 kg/s to 0.029 kg/s implemented. First, single-phase flow consists of only water, and second two-phase Nitrogen-Water mixture flow analyzed experimentally and computationally. For Single-phase flow, two mathematical models used for comparison: the two transport equations k-epsilon turbulence model (K-Epsilon), and the five transport equations Reynolds stress turbulence interaction model (RSM). A Eulerian-Eulerian multiphase approach and the RSM mathematical model developed for two-phase gas-liquid flows based on current experimental data. As area changes, the pressure drop observed, which is directly proportional to the Reynolds number. The computational analysis can show precise prediction and a good agreement with experimental data when area ratio and pressure differences are smaller for laminar and turbulent flows in circular geometries. During two-phase flows, the pressure drop generated shows reasonable dependence on void fraction parameter, regardless of numerical analysis and experimental analysis.

A numerical investigation on single-phase flow characteristics and frictional pressure drop in helical pipes

2020 ◽  
Vol 52 (4) ◽  
pp. 045505
Author(s):  
Pengxin Cheng ◽  
Nan Gui ◽  
Xingtuan Yang ◽  
Jiyuan Tu ◽  
Shengyao Jiang ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Numerical Investigation ◽  
Single Phase ◽  
Flow Characteristics ◽  
Phase Flow ◽  
Single Phase Flow ◽  
Frictional Pressure Drop

Single-Phase Flow Characteristics and Effect of Dissolved Gases on Heat Transfer Near Saturation Conditions in Microchannels

2002 ◽  
Author(s):  
Satish G. Kandlikar ◽  
Mark E. Steinke ◽  
Prabhu Balasubramanian
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Surface Temperature ◽  
Friction Factor ◽  
Single Phase ◽  
Saturation Temperature ◽  
Slight Reduction ◽  
Phase Flow ◽  
Dissolved Gases ◽  
Single Phase Flow

An experimental investigation is carried out to study the heat transfer and pressure drop in the single-phase flow of water in a microchannel. The effect of dissolved gases on heat transfer and pressure drop is studied as the wall temperature approaches the saturation temperature of water, causing air and water vapor mixture to form bubbles on the heater surface. A set of six parallel microchannels, each approximately 200 micrometers square in cross section and fabricated in copper, with a hydraulic diameter of 207 micrometers, is used as the test section. Starting with air-saturated water at atmospheric pressure and temperature, the air content in the water is varied by vigorously boiling the water at elevated saturation pressures to provide different levels of dissolved air concentrations. The single-phase friction factor and heat transfer results are presented and compared with the available theoretical values. The friction factors for adiabatic cases match closely with the laminar single-phase friction factor predictions available for conventional-sized channels. The diabatic friction factor, after applying the correction for temperature dependent properties, also agrees well with the theoretical predictions. The Nusselt numbers, after applying the property corrections, are found to be below the theoretical values available in literature for constant temperature heating on all four sides. The disagreement is believed to be due to the three-sided heating employed in the current experiments. The effect of gas content on the heat transfer for the three gas concentrations is investigated. Nucleation was observed at a surface temperature of 90.5°C, for the reference case of 8.0 ppm. For the degassed cases (5.4 ppm and 1.8 ppm), nucleation is not observed until the surface temperature reached close to 100°C. An increase in heat transfer coefficient for surface temperatures above saturation is observed. However, a slight reduction in heat transfer is noted as the bubbles begin to nucleate. The presence of an attached bubble layer on the heating surface is believed to be responsible for this effect.

Axial dispersion in single-phase flow in a pulsed packed column containing structured packing

1991 ◽  
Vol 46 (3) ◽  
pp. 819-826 ◽  
Author(s):  
A.N.S. Mak ◽  
C.A.J. Koning ◽  
P.J. Hamersma ◽  
J.M.H. Fortuin
Keyword(s):  
Single Phase ◽  
Packed Column ◽  
Axial Dispersion ◽  
Phase Flow ◽  
Single Phase Flow ◽  
Structured Packing

Axial dispersion in single-phase flow in pulsed packed columns

1986 ◽  
Vol 41 (12) ◽  
pp. 3197-3203 ◽  
Author(s):  
J.C. Göebel ◽  
K. Booij ◽  
J.M.H. Fortuin
Keyword(s):  
Single Phase ◽  
Packed Columns ◽  
Axial Dispersion ◽  
Phase Flow ◽  
Single Phase Flow

Pressure drop of single phase flow in microchannels and its application in characterizing the apparent rheological property of fluids

2019 ◽  
Vol 23 (5) ◽  
Author(s):  
Xiaohan Yang ◽  
Netsanet Tesfaye Weldetsadik ◽  
Zafar Hayat ◽  
Taotao Fu ◽  
Shaokun Jiang ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Rheological Property ◽  
Single Phase ◽  
Phase Flow ◽  
Single Phase Flow
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