An experimental investigation on the interaction of hydraulic jumps formed by two normal impinging circular liquid jets

Abstract

The flow field due to two normal impinging liquid jets is different from the flow field associated with a single normal impinging liquid jet, and even from the flow field around two normal impinging compressible fluid jets. Depending on the spacing between the two jets and their relative strengths, different kinds of hydraulic jump interactions are possible, resulting in a variety of flow patterns. The present study experimentally elucidates the jump--jump interactions formed in such cases, for different values of inter-jet spacings and for different strengths of the individual jets. Analogous flow fields associated with the interactions between a single impinging jet and a fence are also studied to allow convenient experimental flow vizualizations.

Planar hydraulic jumps in thin film flow

“…with a chamfering radius of 0.5 mm. A similar chamfered exit was adopted by Kate et al (2007a), Kate, Das & Chakraborty (2007b, 2008 in their experiments on circular hydraulic jumps.…”

“…A past survey reveals very few studies (Liu & Lienhard 1993;Higuera 1994;Singha, Bhattacharjee & Ray 2005) on natural laminar jumps in a planar geometry, with most of the studies inspired by the extensive literature on its counterpart, the circular hydraulic jump (Craik et al 1981;Bowles & Smith 1992;Higuera 1997;Bush & Aristoff 2003;Kate, Das & Chakraborty 2007a;Bhagat et al 2018). Encouraged by the success of shallow water theory for circular jumps (Tani 1949;Bohr, Dimon & Putkaradze 1993;Kasimov 2008), the analytical studies in the planar geometry (Bohr, Putkaradze & Watanabe 1997;Singha et al 2005) have extended the same to propose scaling relationships or to investigate the flow structure in the jump vicinity.…”

Surface tension and instability in the hydrodynamic white hole of a circular hydraulic jump

“…The formation of a hydraulic jump depends on two defining attributes of a liquid, namely, viscosity and surface tension. Various theories have addressed the question of how the circular hydraulic jump forms because of viscosity [2][3][4][5][6][7] and surface tension [8][9][10], with experimental evidence in favour of both means [2,8,[11][12][13][14][15][16][17][18][19].…”

Experimental and Numerical Study of Twin Circular Water Jets Impinging on a Moving Thin Film

“…Because the previous study dealt with single-jet impingement, in the present study, we addressed the characteristics of multiple impinging jets, which have not been clarified so far. Although multiple-jet impingement on a solid surface has been studied by other researchers, 10,11) detailed knowledge on the associated flow mechanics is still lacking.…”