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[Member (365WT)]answers [Chinese ]Time :2019-10-16
Porous plug effect
The temperature change caused by gas expansion through the porous plug. From 1852 to 1862, JP Joule and W. Thomson discovered this effect through a series of experiments. This is an adiabatic throttling process, that is, under adiabatic conditions, the pipeline The high-pressure gas flows through the porous plug throttle valve to the low-pressure side. During the throttling process, when the gas flow is close to the orifice of the porous plug, the cross-sectional area is quickly reduced, and the flow velocity is rapidly increased; after the orifice, the cross-sectional area is gradually increased. Enlargement, flow rate reduction. Since the process is carried out under adiabatic conditions, the net work should be equal to the change of the internal energy of the system. For an ideal gas, after the adiabatic throttling process, the temperature should be constant..For the actual gas, after the adiabatic throttling process, the temperature may decrease, increase or not change, respectively called positive, negative or zero joule-Thomson effect. The positive Joule-Thomson effect is also called the cooling effect. The negative Joule-Thomson effect is also called the pyrogenic effect. The temperature corresponding to the zero-joule-Thomson effect is called the transition temperature of the Joule-Thomson effect. The Joule-Thomson effect is the result of the actual gas deviating from the ideal gas...
The study of adiabatic throttling processes is important for the liquefaction of gases and the design of nozzles and diffusers in steam turbines, jets, compressors and compressors.

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