Flow Distribution in Flat Solar Collectors Systems Interconnected

2012 ◽  
Author(s):  
C. O. Ríos Orozco ◽  
N. C. Uzarraga-Rodriguez ◽  
A. Gallegos-Muñoz ◽  
J. M. Riesco Ávila
Keyword(s):  
Friction Coefficient ◽  
Pressure Drop ◽  
Water Flow ◽  
Solar Collector ◽  
Flow Distribution ◽  
Solar Collectors ◽  
Hydraulic Analysis ◽  
Hydraulic Behavior ◽  
Flow Through

In this work the characterization of the water flow through a flat solar collector and solar collectors systems interconnected is presented. This allows analyzing the behavior of flow distribution in the headers pipe and riser tubes of flat solar collectors. The hydraulic analysis allows determining if the water flow inside the risers presents a no-uniform distribution, having that the mass flow rate through riser tubes increases when they are located a greater distance from inlet of header pipe. This effect also occurs at system composed of several solar collectors interconnected, through their own header pipes, which behaves like a simple flat solar collector with header pipe longer and major number of riser tubes. The hydraulic model of the water flow through a flat solar collector, equipped with different number of riser tubes, is modeled in the FLUENT® software and comparing with theory and methodology knowing for the calculation of pressure drop in pipe sections and accessories. The results show the curves obtained for hydraulic behavior for the cases of study, where is observed that the water flow is no-uniform. This no uniformity provokes that the friction coefficient varies depending of the position of riser tube.

Characterization of the water flow through concrete based on parameter estimation from infiltration tests

2006 ◽  
Vol 36 (9) ◽  
pp. 1575-1582 ◽  
Author(s):  
Vicente Navarro ◽  
Ángel Yustres ◽  
Luís Cea ◽  
Miguel Candel ◽  
Ricardo Juncosa ◽  
...  
Keyword(s):  
Parameter Estimation ◽  
Water Flow ◽  
Flow Through ◽  
Infiltration Tests

Gas holdup and pressure drop for air-water flow through plate bubble columns

1986 ◽  
Vol 64 (3) ◽  
pp. 387-392 ◽  
Author(s):  
B. H. Chen ◽  
N. S. Yang ◽  
A. F. Mcmillan
Keyword(s):  
Pressure Drop ◽  
Water Flow ◽  
Gas Holdup ◽  
Bubble Columns ◽  
Flow Through

scholarly journals Two Efficient Methods for Gas Distributive Network Calculation

2018 ◽  
Author(s):  
Dejan Brkić
Keyword(s):  
Pressure Drop ◽  
Thermodynamic Properties ◽  
Gas Flow ◽  
Flow Distribution ◽  
Gas Pipeline ◽  
Gas Flow Rate ◽  
Closed Loops ◽  
Loop Method ◽  
Hardy Cross ◽  
Flow Through

Today, two very efficient methods for calculation of flow distribution per branches of a looped gas pipeline are available. Most common is improved Hardy Cross method, while the second one is so-called unified node-loop method. For gas pipeline, gas flow rate through a pipe can be determined using Colebrook equation modified by AGA (American Gas Association) for calculation of friction factor accompanied with Darcy-Weisbach equation for pressure drop and second approach is using Renouard equation adopted for gas pipeline calculation. For the development of Renouard equation for gas pipelines some additional thermodynamic properties are involved in comparisons with Colebrook and Darcy-Weisbach model. These differences will be explained. Both equations, the Colebrook’s (accompanied with Darcy-Weisbach scheme) and Renouard’s will be used for calculation of flow through the pipes of one gas pipeline with eight closed loops which are formed by pipes. Consequently four different cases will be examined because the network is calculated using improved Hardy Cross method and unified node-loop method. Some remarks on optimization in this area of engineering also will be mentioned.

Pressure Drop Characteristics of Water Flow Through Static Annular and Triangular Cavity Labyrinth Seals

2008 ◽  
Vol 2 (4) ◽  
pp. 482-495 ◽  
Author(s):  
S. P. Asok ◽  
K. Sankaranarayanasamy ◽  
T. Sundararajan ◽  
P. Starwin ◽  
R. Kalieswaran ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Water Flow ◽  
Labyrinth Seals ◽  
Flow Through

Experimental Characterization of Two-Phase Flow Through Valves Applied to Liquid-Assisted Gas-Lift

2020 ◽  
Vol 142 (6) ◽  
Author(s):  
Renato P. Coutinho ◽  
Paulo J. Waltrich ◽  
Wesley C. Williams ◽  
Parviz Mehdizadeh ◽  
Stuart Scott ◽  
...  
Keyword(s):  
Water Flow ◽  
Two Phase Flow ◽  
Numerical Study ◽  
Water Flow Rate ◽  
Phase Flow ◽  
Experimental Characterization ◽  
Two Phase ◽  
Flow Through ◽  
Gas Lift

Abstract Liquid-assisted gas-lift (LAGL) is a recently developed concept to unload wells using a gas–liquid fluid mixture. The success deployment of the LAGL technology is related to the behavior of two-phase flow through gas-lift valves. For this reason, this work presents an experimental and numerical study on two-phase flow through orifice gas-lift valves used in liquid-assisted gas-lift unloading. To the knowledge of the authors, there is no investigation in the literature on experimental characterization of two-phase flow through gas-lift valves. Experimental data are presented for methane-water flow through gas-lift valves with different orifice port sizes: 12.7 and 17.5 mm. The experiments were performed for pressures ranging from 1.00 to 9.00 MPa, gas flow rates from 0 to 4.71 m3/h, and water flow rate from 0 to 0.68 m3/min. The experimental results are compared to numerical models published in the literature for two-phase flow through restrictions and to commercial multiphase flow simulators. It is observed that some models developed for two-phase flow through restrictions could successfully characterize two-phase flow thorough gas-lift valves with errors lower than 10%. However, it is first necessary to experimentally determine the discharge coefficient (CD) for each gas-lift valve. The commercial flow simulators showed a similar performance as the models available in the literature.

Computational study on drilling mud flow through wellbore annulus by Giesekus viscoelastic model

2020 ◽  
pp. 095440892094380
Author(s):  
Mohammad Amir Hasani ◽  
Mahmood Norouzi ◽  
Morsal Momeni Larimi ◽  
Reza Rooki
Keyword(s):  
Reynolds Number ◽  
Friction Coefficient ◽  
Pressure Drop ◽  
Elastic Property ◽  
Taylor Number ◽  
Drilling Fluids ◽  
Drilling Mud ◽  
Axial Pressure ◽  
Flow Through ◽  
Mud Flow

Cuttings transport from wellbore annulus to the surface via drilling fluids is one of the most important problems in gas and oil industries. In the present paper, the effects of viscoelastic property of drilling fluids on flow through wellbore annulus are studied numerically by use of computational fluid dynamics simulation in OpenFOAM software. This problem is simulated as the flow between two coaxial annulus cylinders and the inner cylinder is rotating through its axes. Here, the Giesekus model is used as the nonlinear constitutive equation. This model brings the nonlinear viscosity, normal stress differences, extensional viscosity and elastic property. The numerical solution is obtained using the second order finite volume method by considering PISO algorithm for pressure correction. The effect of elasticity, Reynolds number, Taylor number and mobility factor on the velocity and stress fields, pressure drop, and important coefficient of drilling mud flow is studied in detail. The results predicted that increasing elastic property of drilling mud lead to an initial sharp drop in the axial pressure gradient as well as Darcy-Weisbach friction coefficient. Increasing the Reynolds number at constant Taylor number, resulted an enhancing in the axial pressure drop of the fluid but Darcy-Weisbach [Formula: see text] friction coefficient mainly reduced.

scholarly journals Experimental characterization of water flow through smooth rectangular microchannels

2005 ◽  
Vol 17 (9) ◽  
pp. 098105 ◽  
Author(s):  
R. Baviere ◽  
F. Ayela ◽  
S. Le Person ◽  
M. Favre-Marinet
Keyword(s):  
Water Flow ◽  
Experimental Characterization ◽  
Rectangular Microchannels ◽  
Flow Through

Using computational fluid dynamics for different alternatives water flow path in a thermal photovoltaic (PVT) system

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
S. Hoseinzadeh ◽  
Ali Sohani ◽  
Saman Samiezadeh ◽  
H. Kariman ◽  
M.H. Ghasemi
Keyword(s):  
Reynolds Number ◽  
Fluid Flow ◽  
Solar Cell ◽  
Pressure Drop ◽  
Water Flow ◽  
Solar Collector ◽  
Flow Path ◽  
Electrical Performance ◽  
Working Fluid ◽  
Content Type

Purpose This study aim to use the finite volume method to solve differential equations related to three-dimensional simulation of a solar collector. Modeling is done using ANSYS-fluent software program. The investigation is done for a photovoltaic (PV) solar cell, with the dimension of 394 × 84 mm2, which is the aluminum type and receives the constant heat flux of 800 W.m−2. Water is also used as the working fluid, and the Reynolds number is 500. Design/methodology/approach In the present study, the effect of fluid flow path on the thermal, electrical and fluid flow characteristics of a PV thermal (PVT) collector is investigated. Three alternatives for flow paths, namely, direct, curved and spiral for coolant flow, are considered, and a numerical model to simulate the system performance is developed. Findings The results show that the highest efficiency is achieved by the solar cell with a curved fluid flow path. Additionally, it is found that the curved path’s efficiency is 0.8% and 0.5% higher than that of direct and spiral paths, respectively. Moreover, the highest pressure drop occurs in the curved microchannel route, with around 260 kPa, which is 2% and 5% more than the pressure drop of spiral and direct. Originality/value To the best of the authors’ knowledge, there has been no study that investigates numerically heat transfer, fluid flow and electrical performance of a PV solar thermal cell, simultaneously. Moreover, the effect of the microchannel routes which are considered for water flow has not been considered by researchers so far. Taking all the mentioned points into account, in this study, numerical analysis on the effect of different microchannel paths on the performance of a PVT solar collector is carried. The investigation is conducted for the Reynolds number of 500.

Comparison of Heat Transfer in Solar Collectors With Heat-Pipe Versus Flow-Through Absorbers

1987 ◽  
Vol 109 (4) ◽  
pp. 253-258 ◽  
Author(s):  
J. R. Hull
Keyword(s):  
Heat Transfer ◽  
Heat Pipe ◽  
Solar Collector ◽  
Hot Water ◽  
Solar Collectors ◽  
Heat Transfer Characteristics ◽  
Absorption Chiller ◽  
Transfer Characteristics ◽  
Proper Design ◽  
Flow Through

Analysis of heat transfer in solar collectors with heat-pipe absorbers is compared to that for collectors with flow-through absorbers for systems that produce hot water or other heated fluids. In these applications the heat-pipe absorber suffers a heat transfer penalty compared with the flow-through absorber, but in many cases the penalty can be minimized by proper design at the heat-pipe condenser and system manifold. When the solar collector is used to drive an absorption chiller, the heat-pipe absorber has better heat transfer characteristics than the flow-through absorber.

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