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International Session
Numerical simulation of fluid flow characteristics at oxygen gas tank with variations compressibility values using openfoam
Journal of Physics: Conference Series, volume 1456 (2020)
DOI: 10.1088/1742-6596/1456/1/012031
Syamsuri, H.S. Maulana, G. Setyono
Abstract
Oxygen gas tank is one application of the decompression tank, which is filled with oxygen with a certain pressure. Oxygen storage tubes is very vital in the health sector, both at the clinic and at the hospital, because most people who are sick or who will undergo surgery in desperate need of clean oxygen. In this study the decompression tank was analyzed using numerical simulation methods using OpenFOAM software. Three different compressibility values of oxygen gas (6.90e-03, 6.90e-04, and 6.90e-05) varied in this study. This is done to find out the results of the pressure distribution and velocity in the tank. From the results of the study with variations in oxygen gas compressibility values, we can know that each compressibility value has different pressure distribution and velocity characteristics even though with the same time and the smaller the compressibility value, the pressure distribution and velocity produced are wider and faster propagating.
Effects of Precursors Concentration on Surface Area of Silica Aerogels Synthesized Via an Ambient Pressure Drying Method
Didik Purwanto, Yustia Wulandari
Chemical Engineering Department, Adhi Tama Surabaya Institute of Technology (ITATS)
Jl. Arief Rachman Hakim 100 Surabaya 60117
Abstract
The objective of present research was to find effect of concentration of water-glass and HMDZ (Hexamethyldisilazane) on silica aerogels synthesized via an ambient pressure. The surface modification resulted in the displacement of pore water from the hydrogels. In order to obtain the aerogels using water-glass precusssor, we mix water, water-glass, HMDZ an ion exchange resin. The base catalyst (ammonium hydroxide) was added to sol so as to accomplish gelation. The gels were aged at 30ºC for 3 days. After aging, the gels were cut 2×2×1 cm to dried at an ambient pressure (1 atm) in three successive steps as follows : at 80ºC for 15 h, at 110ºC for 3 h and finally, at 150ºC for 3 h.
The physical and texture properties of silica aerogels have been reported as the results of the research. The resulting aerogels were cracked bulks, white and having surface area 469,6 to 696,8 cm2/gr.
Keywords: aerogel, ambient pressure drying, silica, sililation agent, water-glass