Reoxygenation by free, wall-supported, and plate-supported rectangular jets plunging into a quiescent pool

Document Type

Journal Article


American Society of Civil Engineers


School of Engineering




Original article published as: Chipongo, K., & Khiadani, M. (2017). Reoxygenation by Free, Wall-Supported, and Plate-Supported Rectangular Jets Plunging into a Quiescent Pool. Journal of Environmental Engineering, 143(8). Original article available here


This paper presents the results of oxygen transfer properties of a free, wall-supported, and plate-supported plunging rectangular jet. Consistently, the free jet had the highest values of oxygen transfer coefficient, KLa20" tabindex="0" id="MathJax-Element-1-Frame">KLa20; wall-supported and plate-supported jets were typically 0.93 and 0.74 times that of the free jet, respectively. At constant jet height hj" tabindex="0" id="MathJax-Element-2-Frame">hj and jet velocity vj" tabindex="0" id="MathJax-Element-3-Frame">vj, KLa20" tabindex="0" id="MathJax-Element-4-Frame">KLa20 decreases as the water depth in the pool increases for all types of jets. This is attributed to a decrease in the air/water interface, also known as the contact area, as volume increases. An optimum water depth, hw′" tabindex="0" id="MathJax-Element-5-Frame">hw, can be inferred for all three supports below which KLa20" tabindex="0" id="MathJax-Element-6-Frame">KLa20 decreases due to the bubble plume impinging on the bottom of the pool. For varying hj" tabindex="0" id="MathJax-Element-7-Frame">hj and vj" tabindex="0" id="MathJax-Element-8-Frame">vj, KLa20" tabindex="0" id="MathJax-Element-9-Frame">KLa20 increases with the former while a power relationship is observed between KLa20" tabindex="0" id="MathJax-Element-10-Frame">KLa20 and the latter for all supported jets. Ultimately, for each type of support an empirical equation based on the properties of the jet and the pool is proposed.