Tag Archives: pressure drop

Large Pressure Drop Indicates a Bomb Cyclone

Welcome to All Sensors “Put the Pressure on Us” blog. This blog brings out pressure sensor aspects in a variety of applications inspired by headlines, consumer and industry requirements, market research, government activities, and you.

Large Pressure Drop Indicates a Bomb Cyclone

One of the first weather oddities to hit the United States in 2018 was the bomb cyclone, or bombogenesis, as meteorologists call it. This type of winter storm with unusually low temperatures is indicated by a low pressure drop of at least 24 millibars (0.35 psi) in 24 hours. With normal pressures around 1000 millibars (14.7 psia) near sea level, this represents a 2.3% change from the normal reading.

In this year’s bomb cyclone, the pressure dropped by 54 millibars in 24 hours, more than twice the standard criteria, indicating a very strong storm. In fact, it was considered one of the greatest rapidly deepening rates ever observed by the National Weather Service.

With the continuous resolution capabilities of microelectromechanical (MEMS) pressure sensors, even the change of a few millibars can be easily observed with an absolute pressure sensor.

NOAA GOES-16 Weather Satellite

The 2018 bomb cyclone as observed from the GOES-16 weather satellite, which is operated by the National Oceanic and Atmospheric Administration.

Comments/Questions?
Do you have a pressure sensing question? Let us know and we’ll address it in an upcoming blog.
Email us at info@allsensors.com

Atomization Pressure

Welcome to All Sensors “Put the Pressure on Us” blog. This blog brings out pressure sensor aspects in a variety of applications inspired by headlines, consumer and industry requirements, market research, government activities and you. In this blog we’ll be discussing the pressure in washing machines.

Atomization Pressure

Pressure applied to a liquid flowing through an orifice produces atomization. Factors affecting the atomized droplets or particles’ size include surface tension, viscosity and density of the fluid. With increased fluid pressure, the particle size will increase. Two common applications of atomization are atomizing spray guns and spray drying.

The pressure feed system for Air Atomizing Spray Guns consists of a pressure feed spray gun, a pressure feed tank (cup or pump), an air filter/regulator, air and fluid hoses and an air compressor. Three pressure reading are made in the process. Critical steps in the set-up include setting the fluid pressure on the fluid regulator between 5 to 10 psi and setting the air atomization pressure on the air regulator between 30-35 psi. The atomization pressure is increased in 3 to 5 psi increments until particle size and finish texture are acceptable.

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Pressure readings in an atomizing spray gun. (Source: Parex USA.)

In a spray drying process, a spray is created by forcing the fluid through an orifice.  A spray dryer feed pump provides the energy required to overcome the pressure drop. In contrast to spray painting, while the spray drying pressure depends on feed characteristics and desired particle size, it can range from 300 to 3,000 psig.

 What do you think/Comments?
Do you have a pressure sensing question? Let me know and I’ll address it in an upcoming blog.
– Han Mai, Senior Marketing Specialist, All Sensors Corporation (hmai@allsensors.com)