| Summary: | This study aims to determine the effect of nozzle dimensons on the
performance of liquid jet gas pump which functioned as a vacuum pump. Liquid
jet gas pump is an energy conversion device that is able to drain the fluid air
(secondary flow) by utilizing the water fluid (primary flow/motive flow) by
ulitilizing the water fluid (primary flow/motive flow) based on the pressure
different between the two fluids without using moving parts.
The term of dimensions of the nozzle is the diameter of the nozzle on the
outlet stream of the motive. The study was conducted using experimental method
with the parameters studied are the relationship between the dimensions of the
nozzle efficiency, flow ratio, and coefficient of the nozzle. The type of nozzle
used is straight-hole nozzle with a diameter of 8, 9, 10, 11, and 12 mm. While the
primary flow ranged from 0.44 to 1.44 L/s and secondary flow ranged from 0.04
to 0.42 L/s.
The results showed a significant relationship between change in the
dimensions of the nozzle to the efficiency and the coefficient of the nozzle, which
with increasing diameter of the nozzle tends to result in decreased efficiency and
coefficient of the nozzle. The resulting maximum efficiency of each nozzle with a
nozzle diameter of 8, 9, 10 ,11, and 12 mm respectively were 20.21, 16.77, 6.58,
12.25, and 6.99 %. While the coefficient of the nozzle row is 0.88, 0.76, 0.61,
0.76, and 0.76.
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