Abstract
To prevent the contaminated water from flowing back into the potable water supply, Particle Image Velocimetry (PIV) was employed to measure the variation of flow field and study the relation between the minimum air gap h and the water outlet diameter d concretely. The theoretical analysis and the experimental results show that the h/d is not vary linearly as required in ‘Code for Design of Building Water Supply and Sewerage’ but exponentially.
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