Discussion of 'Experimental Study on the Multisegment Regime of the Water Flow in Drip Emitters' by Wei Qingsong, Lu Gang, Wang Li, Zheng Jincan, Liu Jie, and Shi Yusheng

摘要

The authors are appreciated for presenting an experimental procedure that simulates the change of emitter flow exponents with different ranges of water pressures examined. The present analysis first deals with the calculation of the emitter flow exponent, the average flow velocity, and the Reynolds numbers with regard to different phases of water pressures, then with the determination of the best choice among the pressure ranges examined for five types of drip emitters tested. For these purposes, this paper is essentially focused on three research topics: (1) change of flow exponents with different pressure segments, illustrated by the original paper's Table 4 and Figs. 1 and 2; (2) the relationship between average flow velocities and water pressures, illustrated by the original paper's Figs. 3 and 4; and (3) the relationship between Reynolds numbers and flow exponents, illustrated by the original paper's Figs. 5 and 6.