Determine spray droplets on water sensitive paper (WSP) for low pressure deflector nozzle using image J

2nd International Conference on Computational Fluid Dynamics in Research and Industry

力学;计算机科学;工业技术

Sies, M.F.^1 ; Madzlan, N.F.^1 ; Asmuin, N.^1 ; Sadikin, A.^1 ; Zakaria, H.^1

Faculty of Mechanical and Manufacturing Engineering, Universiti Tun Hussein Onn Malaysia (UTHM), Johor Batu Pahat

86400, Malaysia^1

关键词: Liquid viscosity;    Lower air pressure;    Orifice diameters;    Phase Doppler anemometry;    Pressurized air;    Sauter mean diameter (SMD);    Tangential flow;    Water sensitive paper;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/243/1/012047/pdf
DOI  :  10.1088/1757-899X/243/1/012047

来源: IOP

【 摘 要 】

In this study, determine of spray droplets size (SMD) using water sensitive paper (WSP) at low fluid pressure with deflector nozzle or tangential flow nozzle model Delavan AL75 and New Design Nozzle with two different type of swirl (ND2.5 A1.0 & ND2.5 B1.0). These three deflected flat sprays have used at different liquid mixing ratio. These liquid mixture ratios are pure water, 10% of lime juice + 90% of water (L10W90) and 30% of lime juice + 70% of water (L30W70). WSP is used to collect the spray droplets from nozzles. The operational liquid pressure of each nozzle is 3 bar, while air operational pressures are 3 bar and 6 bar. Then, the WSP were scanned using scanner then it was analyzed using ImageJ software. ImageJ can be used for determining the diameter of droplets size on the WSP. As the results from an experiment, the AL75 nozzle recorded the lowest Sauter mean diameter which is 193.69μm at 6 bar of pressurized air while ND2.5 A1.0 recorded the highest Sauter mean diameter which is 353.61μm at 3 bar of pressurized air. Summary from the experiment shows that the higher of droplet size is because of the lower air pressure (3 Bar). Then, increasing of liquid viscosity also increase the SMD. The orifice diameter for New Design nozzle (ND-2.5) is smaller than AL75, which are 2.5mm and 2.8mm respectively. The different nozzle design also gives effect the SMD. WSP is an alternative method to determine SMD for spray droplets with the low cost if compared to Phase Doppler Anemometry (PDA).