Research Papers: Flows in Complex Systems

Experimental Studies on the Effect of Suction Chamber Angle on the Entrainment of Passive Fluid in a Steam Ejector

[+] Author and Article Information
A. S. Ramesh

Department of Mechanical Engineering,
St. Xavier's Catholic College of Engineering,
Nagercoil 629003, Tamil Nadu, India

S. Joseph Sekhar

Department of Mechanical Engineering,
St. Xavier's Catholic College of Engineering,
Nagercoil 629003, Tamil Nadu, India
e-mail: josephsekhar@hotmail.com

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received March 24, 2017; final manuscript received August 10, 2017; published online October 4, 2017. Assoc. Editor: Moran Wang.

J. Fluids Eng 140(1), 011106 (Oct 04, 2017) (8 pages) Paper No: FE-17-1180; doi: 10.1115/1.4037692 History: Received March 24, 2017; Revised August 10, 2017

In this experimental study, the impact of suction chamber angle (SCA) on the entrainment ratio of a steam ejector refrigeration system (ERS) of 700 W was investigated. The basic dimensions of the ejector were derived from the compressible fluid flow equations using matlab. The system was tested with six different SCAs with various operating conditions, and its performance was analyzed. It is inferred that the entrainment of passive fluid from the evaporator is the strong function of the SCA. For all the active steam pressures, the entrainment of the passive fluid increases up to 12 deg of SCA, and above that the performance decreases significantly. Optimum angle of suction chamber increases the entrainment ratio for at least 49.96%. It is also found that the SCA has a minor influence on the back pressure.

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Fig. 1

Schema of the steam jet refrigeration system

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Fig. 2

Schema of the ejector and its pressure and velocity profile. (a) schema of the ejector and (b) pressure and velocity profile along the ejector.

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Fig. 3

Flowchart to predict the basic geometrical parameters of the ejector

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Fig. 4

Schema of the experimental ERS

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Fig. 5

Ejectors fabricated for various SCAs

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Fig. 6

Effect of SCA on entrainment ratio for various active fluid pressures

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Fig. 7

Performance curves for boiler pressures 1.6 bar and 2 bar

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Fig. 8

Performance curves for boiler pressures 3 bar and 3.5 bar



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