scholarly journals Effect of tapered headers on pressure drop and flow distribution in a Z-type polymeric solar absorber

Solar Energy ◽  
2022 ◽  
Vol 232 ◽  
pp. 283-297
Author(s):  
Alireza Shantia ◽  
Wolfgang Streicher ◽  
Chris Bales
Keyword(s):  
Pressure Drop ◽  
Flow Distribution ◽  
Solar Absorber

Method for Computing Flow Distribution and Pressure Drop in Multichambered Baghouses

JAPCA ◽  
1988 ◽  
Vol 38 (1) ◽  
pp. 39-45
Author(s):  
Duane H. Pontius ◽  
Wallace B. Smith
Keyword(s):  
Pressure Drop ◽  
Flow Distribution

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.

scholarly journals Experimental Verification of Dimensional Analysis Results on Flow Distribution and Pressure Drop for Disc-Type Windings in OD Cooling Modes

2018 ◽  
Vol 33 (4) ◽  
pp. 1647-1656 ◽  
Author(s):  
Xiang Zhang ◽  
Muhammad Daghrah ◽  
Zhongdong Wang ◽  
Qiang Liu ◽  
Paul Jarman ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Dimensional Analysis ◽  
Experimental Verification ◽  
Flow Distribution

An IHX Design for Pool Type LMFBR System Application

1980 ◽  
Vol 102 (3) ◽  
pp. 563-567
Author(s):  
D. D. DeFur
Keyword(s):  
Pressure Drop ◽  
Tube Bundle ◽  
Flow Distribution ◽  
Significant Feature ◽  
Transient Conditions ◽  
Mechanical Feature ◽  
Cold Pools ◽  
Side Pressure ◽  
Pump Inlet ◽  
Pool Type

This paper presents the design of a 500 MWt Intermediate Heat Exchanger (IHX) for application in a multi-zone pool-type Liquid Metal Fast Breeder Reactor System. The primary feature around which this design was developed is the ability to function under all steady-state and transient conditions without the need for a distinct mechanical feature to accommodate differential thermal expansion between the tube bundle and shell. This is accomplished by using thermal baffles and judiciously adjusting the ratio of shell length in contact with the hot and cold pools of the multi-zone reactor. Thus, the component shell is maintained at a higher temperature than the tube bundle and the tubes are basically tension members. Under certain transient conditions the tubes heat up and become compression members but are not loaded to the point of buckling. A secondary, but not less significant, feature is the low primary side pressure drop and good flow distribution offered by this design. (Multi-zone reactor systems have no hard piping between the IHX outlet and primary pump inlet; therefore, the relatively small differential head of sodium between the two pools is the only driving element which causes flow through the primary side of the IHX. For this reason, a low primary side pressure drop is essential). To accomplish this, the primary sodium flows through the tube side of the component where the flow channel is simple and unimpeded by tube supports or other restrictions. Secondary flow distribution, through the shell side of the unit, can be adjusted as required since a higher pressure drop can be tolerated.

Numerical Simulation Applied to Study the Effects of Fractal Tree-Liked Network Channel Designs on PEMFC Performance

2012 ◽  
Vol 488-489 ◽  
pp. 1219-1223 ◽  
Author(s):  
Shan Jen Cheng ◽  
Jr Ming Miao ◽  
Chang Hsien Tai
Keyword(s):  
Fuel Cell ◽  
Pressure Drop ◽  
Flow Field ◽  
Fluid Dynamic ◽  
Flow Distribution ◽  
Flow Channel ◽  
Proton Exchange ◽  
Channel Network ◽  
Computational Fluid Dynamic Analysis ◽  
Network Channel

The effect of pressure drop and the flow-field of inhomogeneous transport of reactions gas are two important issues for bipolar flow channel design in proton exchange membrane fuel cell (PEMFC). A novel design through the imitation of biological development of the topology distribution of fractal tree-liked network channel is the main topic of this research. The effects of different Reynolds numbers and stoichiometric mass flow rate of reaction gas on the flow field distribution of tree-like channels were investigated by three-dimensional computational fluid dynamic analysis. According to numerical simulations, the fractal tree-liked network channel would have an excellent performance on the uniformity of multi-branching flow distribution and lower pressure drop along channels. The new type of fractal tree-liked bionic flow channel network design will be applied to assist in the experimental reference for improving the performance of fuel cell stack system in PEMFC for future.

Simulate Design of Direct Air Cooling Exhausted Duct System for 1000MW Super-Critical Thermal Power Unit

2014 ◽  
Vol 535 ◽  
pp. 180-184
Author(s):  
Chun Qing Wang ◽  
Cai Xia Bian ◽  
Di Wang
Keyword(s):  
Pressure Drop ◽  
Flow Field ◽  
Power Unit ◽  
Flow Resistance ◽  
Thermal Power ◽  
Flow Distribution ◽  
Cooling Power ◽  
Air Cooling ◽  
Exhaust Pipe ◽  
Balanced Flow

Balancing flow distribution and decreasing the pressure drop in each vapor distributing pipe are the importance of the study of exhaust pipe of direct air cooling power unit.In order to balance flow distribution and decreasing the pressure drop in each vapor distributing pipe,and simulate the flow field when add different chamfer on the back of exhausted pipe or not ,then using the CFD software called FLUENT,the steam flow field of exhausted pipe for a 1000 MW power unit with direct air cooling is stimulated under typical steam turbine conditions.The result shows that the steam flows through each distribution pipe with balanced flow under the condition of chamfer angle of 30 °and the flow resistance is much lower than before．

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