02970nam a2200397 4500 20260817162014.0 200598 th eng .b10063742 AIT Thesis no.WA-85-53 Adith Suthinsak Air entrainment from aeration device Bangkok : Asian Institute of Technology, 1985 93 p. Thesis ; no. WA-85-53 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology Thesis (M.Eng.) - Asian Institute of Technology, 1985 Cavitation erosion at the surface of the hydraulic structure subjected to the high velocity flow is caused by the surface irregularities. A successful and cheap method to prevent the erosion is to supply an amount of air into the flow through an aeration device. An experimental study on the phenomena of the air entrainment from aeration device was carried out in the hydraulic model of two types of device, namely; (i) plane groove type and, (ii) combined groove-deflector type. Air concentration at the chute bottom from the groove type is found too low to protect the surface from cavitation erosion. For the combined type the efficiency is much improved, air concentration found in the flow downstream of the jet impingement shows a typical distribution. A conceptual model was developed from the "Mixing length" theory of the velocity distribution and the free jet assumption to determine the air flow from the device. A linear relationship of the measured air concentration and the air discharge estimated from the model is found. A Model of aeration device with 1:2 scale ratio was constructed according to the Froude law of similarity. The measured air concentration is very low comparing with the prototype result, the model size is considered too small to be used for the purpose of comparison. Water Air entrainment Cavitation Prida Thimakorn, Chairperson Tawatchai Tingsanchali, Examination Committee Wang, Tsan-Wen, Examination Committee The Government of France, Scholarship Donor Asian Institute of Technology. Thesis ; no. WA-85-53 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B20183 .b10063742 mnait s 240409 2 951012 m a s 0 mnait mnarc 22 40 Barcode : 30050120573323 CREATED : 2014-02-04 RECORD # : i12785179 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050160035118 CREATED : 2016-09-02 RECORD # : i12878686 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 3473 3473 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no.WA-85-53 30050120573323 2026-08-17 16:20:14 3 2026-08-17 22 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no.WA-85-53 30050160035118 2026-08-17 16:20:14 2026-08-17 40