An Experimental Investigation of Reaeration and Energy Dissipation in Hydraulic Jump

Hydrodynamics Matters: Unravelling the Gas Transfer Law for the Energy Dissipation Process in a High-energy Stream

“…observed in hydraulic jumps. Further supporting evidence for the positive correlation between Reynolds number and transfer efficiency includes: (1) The Reynolds number fromWilhelms et al (1981)'s data falls within the range of 1.4 × 10 5 to 1.6 × 10 5 , and the transfer efficiencies align more closely with our present study, surpassing the data fromZhao et al (2022); (2) Analyzing separately two groups of data fromKucukali and Cokgor (2020), one with a Froude number around 4, where an increase in Reynolds number from 7.6 × 10 4 to 1.9 × 10 5 , results in a transfer efficiency rise from 0.033 to 0.071, and another group with a Froude number around 5, showing an increase in Reynolds number from 9.5 × 10 4 to 1.7 × 10 5 leads to a transfer efficiency increase from 0.057 to 0.093.Wang & Chanson (2016) explored cases with Reynolds numbers between 2.1 × 10 4 and 1.6 × 10 5 , indicating roller surface dynamics and bubble dynamics are scale-sensitive.Particularly, as the Reynolds number increases, the frequency of roller surface oscillation tends to rise. Moreover, higher Reynolds numbers lead to enhanced turbulent shear forces, resulting in the breakup of larger bubbles, and a marked increase in the interfacial area.…”

“…7 Hydraulic jump transfer efficiency normalized to 20°C (E 20 ) as a function of energy loss along the hydraulic jump (E L ) relative to the upstream total water head (H 1 ). [Comparison ofpresent data with that ofApted and Novak (1973),Avery and Novak (1978),Wilhelms et al (1981),Kucukali and Cokgor (2020),Zhao et al (2022).…”

“…One factor is the methodology employed to determine the transfer efficiency. May of the previous studies sampled the concentration at both upstream and downstream locations of the hydraulic jump and determined the transfer efficiency by analyzing variations along the hydraulic jump (Kucukali and Cokgor, 2020;Wilhelms et al, 1981). However, for indoor channel experiments, the concentration difference over such a brief distance is typically small and might be significantly affected by manuscript submitted to Water Resources Research measurement errors.…”