Experimental investigation of oxygen transfer efficiency in hydraulic jumps, plunging jets, and plunging breaking waves

Anip Kumar Paul,Ashabul Hoque

doi:10.2166/ws.2022.052

Abstract

Abstract The scope of the paper is to analyse the different similarities of air entrainment among the hydraulic jumps, plunging jets, and plunging breaking waves and to discuss current practices. The measured data are reexamined and scrutinised to investigate the gas exchange phenomena through an air-water interface. In particular, oxygen transfer efficiency and penetration depth by air bubbles are discussed. The calculated results highlight that the oxygen transfer efficiency is decreased with the increase of energy dissipation rate both in plunging jets and breaking waves. In contrast, it is shifted almost parallel in the case of hydraulic jumps. In addition, the aeration lengths in the hydraulic jumps and penetration depths both in plunging jets and plunging breaking waves were dependent on the jet impact velocity.

Highlights

The gas fluxes like oxygen, carbon dioxide through the air-water interface provide significant developments of the climate system (Tans et al 1990)
The penetration depth of air bubbles created by plunging water jet, Penetration depth (Pd), and the oxygen transfer efficiency results (OTE) is plotted in Figure 4, which are varied with the jet impact velocity V1 and energy dissipation rate Epj, respectively
The analogies of gas exchange among hydraulic jumps, plunging jets, and plunging waves may be appropriate to work out quantities under modelling efforts

Summary

INTRODUCTION

The gas fluxes like oxygen, carbon dioxide through the air-water interface provide significant developments of the climate system (Tans et al 1990). Bostan et al (2013) measured the dissolved oxygen in hydraulic jump using a handy oxygen meter for five different jet flow rates They obtained the oxygen transfer efficiency, which was increased with relative energy loss. There is a clear need for some fundamental studies on the characterisation of air entrainment, aeration system, and oxygen transfer efficiency in hydraulic jumps, plunging jets, and plunging wave breakers. In this context, the present study presents a new series of detailed physical experiments of air entrainment in vertical plunging jets. Provides a detailed and comprehensive analysis of oxygen transfer efficiency

REVIEW OF A GAS EXCHANGE MODEL

Hydraulic jumps

Data collection

Plunging jets

Descriptions of measurement

Plunging breaking waves

RESULTS AND DISCUSSION

CONCLUSIONS