Q:Ā May I have your advice for a formula sheet to size a vortex flowmeter? Is the data below enough for specification and is there a specification form I should use? Could you advise if the use of vortex flowmeter is the best selection for a low-pressure steam application?
Steam flowmeter
Normal flow:Ā 2,200 kg/hr
Pressure:Ā 3 barg
Temperature: 144 °C
Parninggo Butar
instrument engineer in Indonesia
[email protected]
A1: Before answering your question, I'd like to tell you how the theory of vortex shedding was born, and share the role that fishing and Saint Christopher played in its discovery. An observant young man named Tódor KÔrmÔn was fishing at a spring in Budapest, Hungary, and noticed vortices forming behind bluff-shaped rocks, but not behind streamlined ones.
He was fishing at the same spot one day after a rain and noticed the water was running faster, but the distance between the vortices shedding from alternate sides of his bluff rock were the same. This was because the change in the water's speed changed only the number of vortices,Ā but not the distance between them.
Later, his class of engineering students took a trip from Budapest to Bologna and visited the great museums. While the other students just walked by a 14th century painting, the observant Tódor stopped. On the painting, a giant rendering of St. Christopher with a bluff-shaped walking cane in his hand was carrying little Jesus across a river. Tódor whispered: "The fish jump at equal distances and on alternate sides."
It took Tódor some years to figured out that the distance between vortices has to do with the size of the bluff body. It was then that a key unit of traveling in air or water, the ratio of inertial and viscous forces, was discovered.
At the age 34,Ā as a soldier in the Austro-Hungarian army in World War I, he used that knowledge to design an early helicopter. Later, he advanced rocket science and became the first director of NASA's space exploration laboratory, among many others. He measured the thickness of theĀ earth's atmosphere and afterābesides being referred to as one of the "Martiansāāhe received the U.S.'s first National Medal of Science in 1962.