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“The environment of the plant is very bushy and if a customer mistakenly throws away a lit cigarette butt in this area, we wont know what will happen.
“Therefore, we have to suspend their operations until they meet the minimum safety requirement,” he added.
The Controller said that the department would continue the inspection of all facilities selling cooking gas and others to ensure compliance with safety and other regulations.How to get a license to hand out flyers, circulars, or other paper advertisements.
How to get a license to sell, transport, or store hazardous materials.
How to get a license to run a pawn shop.
How to get a license to sell or appraise precious metals.
How to get a license to use a scale or electronic scanner at your business.Sarah, an undergraduate in the group, won a Population Health Recognition Award for her presentation at the UW's Undergraduate Research Symposium titled “Rhizosphere Changes Help Explain the Reduced Nutritional Quality of Rice under Elevated Carbon Dioxide: Evidence from a Controlled Greenhouse Study.” The award is part of the university’s Population Health Initiative and includes a $100 gift certificate.Alaska's Mt. Redoubt volcano a beautiful sight for anglers--so far
Fishing season has begun in Alaska and anglers visiting the Kenai Peninsula will want to tote cameras regardless of how well the salmon and halibut are cooperating.
That's because Mt. Redoubt volcano is erupting in a mild manner--for the time being--and generating spectacular imagery. The accompanying photo was taken May 26 by Dennis Josefczyk, from the peninsula, which is about 50 miles east of the volcano, across the Cook Inlet.
The Alaska Volcano Observatory reports low seismic activity and as long as that remains the case travel disruptions should be minimal or nonexistent. However, Redoubt's mood could change instantaneously so visitors are encouraged to check the AVO website and consult their airline carriers in the days leading to their departure date.
Good fishing everyone. Hope you enjoy the show.
-- Pete ThomasSimulation of ejector for vacuum generation

Supersonic ejectors are used in a wide range of applications such as compression of refrigerants in cooling systems, pumping of volatile fluids, or vacuum generation. The objective of the present paper is to mesh and simulate, in an OpenFOAM environment with an open access implicit density-based solver HiSA, the physics of the vacuum ejector, and, later, compare the results with experimental measurements. In order to achieve this a 2D axisymmetric mesh made by hexahedral cells has been created. Steady solutions have been obtained, with prescribed total pressure in primary and secondary inlets. Secondary total pressure ranges from 1 to around 0.2 bar in which the secondary flow is zero. Numerical results are compared with experimental measurement, with two flowmeter sizes for small flow rate accuracy. Two regimes are encountered. In supercritic regime the secondary is chocked and sonic flow is reached in the second nozzle. In subcritic regime, the secondary flow is subsonic. The agreement is good, although simulation tends to slightly overestimate flow rate for large values region.


Introduction
Supersonic ejectors are used in a wide range of applications such as compression of refrigerants in cooling systems, pumping of volatile fluids, or vacuum generation. In this latter case, also known as zero-secondary flow, physics in the vacuum ejector is more complicated than in steady cases, since recirculation bubbles existing in the diffuser exhibit transient behaviour during the start-up period [1].
In the supersonic ejectors the main concern is to achieve the maximum vacuum level and to increase the flow rate of suction. The induced flow, or secondary flow, is the air that is being carried across the second nozzle.
In Figure 1 a scheme of the primary and secondary flow, as well as the mixing chamber where both flows join, is presented. Figure 2 shows the model of the ejector simulated.
The purpose of the present paper is to numerically simulate an ejector and compare results with experimental measurements.  [2] ejectors are used for vacuum generation since 1901. In this thesis the effect of sub-critical and critical function modes of an ejector is discussed.
The present work is based on the work of Jafarian [2] which is the first to study the transient phenomena in vacuum ejectors. According to Mazzelli [3], the best turbulence model for this kind of numerical simulation is the K-w SST, and, thus, it has been used in the present paper.
It has been used in this work the HiSA [4] implicit solver but some years before Xiang Gao et al. [5] developed a parallel density-based implicit solver with OpenFOAM, although it has not been used.
Arun Kumar et al. [6] wanted to show the physics of vacuum generation in ejectors when they are in zero-secondary flow such as bubbles on the secondary flow that obstruct the entrainment of air.

Experimental set up
In the Figure 3, the experimental setup is schematically presented.
The primary pressure, denoted by P in Figure 3, has been kept steady and at a value of 6 bar for all the measurements. This pressure feeds the ejector, which sucks out the air from the vessel. The vacuum level achieved in the vessel is measured in the manometer P3.
The ball valve, in the scheme V2, controls the flow rate in and out the vessel when the system reaches a steady state. The flow rate is measured with a nozzle flow meter, shown in the picture as P2.
The performance curve obtained gives the values of the induced flow rate for each operating condition. The secondary flow is maximum for atmospheric pressure in the vessel and it decreases    Figure 4 shows a theoretical characteristic curve with a decreasing flow rate while increase the vacuum level.

Numerical results
For a supersonic compressible flow, density based models are the favourite because of its capacity of capture discontinuities created by the shock waves. The equations for unsteady compressible flow are, for mass, momentum and energy, with the perfect gases equation, have been solved on the OpenFOAM simulation toolbox. In the present paper the open access implicit density-based solver HiSA [4], that implements the AUSM+up upwind scheme for face fluxes, has been used. This solver allows to solve unsteady flows with larger Courant numbers than explicits solvers. According to Mazzelli [3], it has been proved that the best turbulence model are the k-w SST, and thus, it has been used in the present simulations.
The 2d axisymmetric hexahedra-dominated mesh has been generated with blockMesh, in order to get a suitable good quality. A python code that, eventually, creates the required dictionary, blockMeshDict, has been also used. This mesh is composed of 20300 cells. Figure 5 and Figure 6 show the total view of the mesh and the detail of the mixing chamber.
The boundary condition in primary inlet is 6 bar (relative) of total pressure, and Neumann condition for velocity. In the secondary inlet also the pressure is prescribed, and the flow rate is given by the simulation. In outlet the standard atmospheric pressure is set but, in order to avoid reflections, the waveTransmissive boundary condition is used.   A series of simulations, where the pressure at the secondary inlet has been changed, have been performed. The secondary pressure has ranged from atmospheric pressure (1 bar) to 0.2 bar. For each of this pressures the flow rate has been calculated. Figure 7 shows the numerical and the experimental results for the same geometry and operating conditions. A good agreement is found, although it seems that the numerical simulations overestimate the flow rate, about 10%, at the same vacuum pressure for small vacuum level of Ps = 0.28 up to Ps = 1 (large values of pressure in vacuum level) while underestimate the flow rate, about less than 5%, in the low values of vacuum pressure, at Ps = 0.21 up to Ps = 0.28.

Experimental and numerical data
It also tends to slightly overestimate the value of maximum pressure level: zero flow performance at Ps = 0.2 in the experimental results whereas Ps = 0.217 in the numerical ones.

Subcritical and critical modes
According to the thesis of Del Valle [2], it should be possible to observe a two regimens of secondary flow rate. So, at the beginning this flow is shocked at the very exit of the second nozzle. When at the vessel is at some vacuum level, the flow rate becomes sub-critical, and, finally, gets stuck so it becomes a zero-secondary flow ejector. In the fig, 8 is possible to see how the secondary flow is retained before the mixing chamber, due to the flow expansion of the primary flow.

Conclusion
Simulations of a supersonic ejector for vacuum generation have been presented. Simulations have been performed with the open source implicit density-based HiSA in the frame of the OpenFoam toolbox. Numerical results have been compared with experimental measurements, with an acceptable agreement, although CFD tend to slightly overestimate flow rate for the high values range.
It has been proved that the HiSA is a suitable implicit compressible gas based on density solver, and that it has been able to obtain results in less time expected than the explicit solvers. The ejector simulated goes from a critical mode to a zero-secondary flow at 0,217 bar, which is approximately