NUMERICAL INVESTIGATION OF WATER SPRAY SYSTEM IN THE ENTRANCE REGION OF A 2 D CHANNEL USING LAGRANGIAN APPROACH.

1994 ◽  
Author(s):  
Miroslav Jicha ◽  
K.C. Karki ◽  
Suhas V. Patankar
Keyword(s):  
Numerical Investigation ◽  
Lagrangian Approach ◽  
Entrance Region ◽  
Water Spray ◽  
Spray System

Numerical Investigation of a Fiber Web Effect on the Pressure Drop and Particles Collection in a Microchannel

2009 ◽  
Author(s):  
Alireza Dastan ◽  
Omid Abouali
Keyword(s):  
Pressure Drop ◽  
Flow Field ◽  
Numerical Investigation ◽  
Particle Motion ◽  
Particle Deposition ◽  
Hydraulic Diameter ◽  
Lagrangian Approach ◽  
Computational Domain ◽  
Governing Equations ◽  
Eulerian Approach

In this paper pressure drop and particle deposition in a microchannel with a hydraulic diameter of 225 micrometer is investigated numerically. Several hundred micron length fibers caught at the entrance of the channels making a “fiber web” also is modeled in this research. Governing equations for the flow field are solved with an Eulerian approach while the equations of particle motion in the flow are solved by a Lagrangian approach. Assuming the symmetry in the domain, one channel and the corresponding plenum are studied in the computational domain. For studying the effects of fibers in the flow, two fiber webs with four and six solid fibers are studied. The increase of pressure drop in the microchannel because of the entrance fiber web is computed and discussed. Also deposition and collection of the particles with various diameters at the fiber webs are also presented.

scholarly journals Experimental investigations of spray flow rate and angle in enhancing the performance of PV panels by steady and pulsating water spray system

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Mojtaba Nateqi ◽  
Mehran Rajabi Zargarabadi ◽  
Roohollah Rafee
Keyword(s):  
Cooling System ◽  
Spray Cooling ◽  
Spray Angle ◽  
Experimental Investigations ◽  
Water Spray ◽  
Maximum Increase ◽  
Photovoltaic Panel ◽  
Electrical Efficiency ◽  
Spray System ◽  
Pv Panel

AbstractIn this study, a spray cooling system is experimentally investigated to increase the photovoltaic panel efficiency. Cooling of photovoltaic panels is one of the important parameters that affects the PV panel performance. In this experiment the effects of spray angle, nozzles to PV panel distance, number of nozzles, and pulsating water spray on the PV panel performance are investigated. For this purpose, an experimental setup was made. The spray angles varied from 15° to 50°. The comparison between the spray angles shows that by decreasing the spray angle to 15° increases the electrical efficiency of PV panel to 19.78% and simultaneously the average PV panel temperature decreases from 64 (for non-cooled PV) to 24 °C. Also, nozzle to PV panel distance was changed from 10 to 50 cm. The best result was obtained for the lowest distance by 25.86% increase in power output. Study of various frequency also show that due to the surface evaporation and the intensity of the radiation, increasing the water spraying frequency can increase or decrease the electrical efficiency. The On–Off water spray system results show that the maximum increase in efficiency was obtained with frequency of 0.2 Hz which it was 16.84%. Water consumption also decreased to half.

Numerical Investigation on Characteristic Lengths for Gaseous Detonation with Dilute Water Spray

2019 ◽  
Author(s):  
Hiroaki Watanabe ◽  
Akiko Matsuo ◽  
Ashwin Chinnayya ◽  
Ken Matsuoka ◽  
Akira Kawasaki ◽  
...  
Keyword(s):  
Numerical Investigation ◽  
Gaseous Detonation ◽  
Water Spray

Explosion Simulation for Petrochemical Plant with Water Spray

2013 ◽  
Vol 634-638 ◽  
pp. 1608-1611
Author(s):  
Ji Wu Yuan ◽  
Xiang Di Zhao ◽  
Zheng Wang
Keyword(s):  
Coal Gasification ◽  
Petrochemical Plant ◽  
Water Spray ◽  
Design And Optimization ◽  
Traditional Assessment ◽  
Spray System ◽  
System A ◽  
Assessment Techniques ◽  
Plant Simulation ◽  
Explosion Risk

Traditional assessment techniques can't predict the explosion with effects of water spray system. A method of explosion simulation which based on FLACS software for Petrochemical plant with water spray were used for simulating the explosion risk of a coal gasification company’s plant. Simulation results indicate that the water spray system can significantly weaken the devices exploded consequences. This method can be used for fire protection system design and optimization of layout for petrochemical plants.

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