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Paper Information

Journal:   MODARES MECHANICAL ENGINEERING   MARCH 2018 , Volume 18 , Number 1 ; Page(s) 273 To 280.
 
Paper: 

PROPOSAL OF EXPERIMENTAL RELATIONS FOR DETERMINING THE NUMBER OF SIDES OF POLYGONAL HYDRAULIC JUMPS

 
 
Author(s):  SOUKHTANLOU EHSAN, TEYMOURTASH ALI REZA*, MAHPEYKAR MOHAMMAD REZA
 
* DEPARTMENT OF MECHANICAL ENGINEERING, FERDOWSI UNIVERSITY OF MASHHAD, MASHHAD, IRAN
 
Abstract: 

The circular hydraulic jump usually forms when a liquid jet impinges on a horizontal flat plate. However, under certain conditions of fluid viscosity, volume flow rate and obstacle height downstream of the jump, the flow changes from super-critical to sub-critical and hydraulic jump changes shape from circular to polygonal. Despite the phenomenon of the hydraulic polygon jump has observed about two decades, the experimental relationship has not been presented to estimate the number of sides of hydraulic polygon jumps. The size and number of sides of a polygonal hydraulic jump depend on various factors such as fluid volume flow rate, jet diameter, fluid height downstream of the jump, and fluid physical properties; in other words, they depend on the dimensionless numbers of Reynolds, Weber, and Bond. Hence, in this study Taguchi analysis, as a Design of Experiment method, was used to investigate the effect of volume flow rate, jet diameter and obstacle height downstream of the jump on the number of the sides of a polygon hydraulic jump and Linear and nonlinear relationships was proposed for estimating the number of the sides of a polygonal hydraulic jump in terms of the above mentioned parameters.

 
Keyword(s): POLYGONAL HYDRAULIC JUMP, DESIGN OF EXPERIMENTS BY TAGUCHI METHOD, LEAST SQUARE METHOD
 
References: 
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