000			02946nam a2200385 4500
005			20260817162014.0
008			210598 th eng
035			_a.b10063754
099		9	_aAIT Thesis no.WA-86-5
100	1		_aHameed, Tahir
245	1	0	_aAir entrainment from aeration grooves of square shape
260			_aBangkok : _bAsian Institute of Technology, _c1986
300			_a78 p.
490	1		_aThesis ; _vno. WA-86-5
500			_aA thesis study submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology
502			_aThesis (M.Eng.) - Asian Institute of Technology, 1986
520			_aHigh velocity flow in hydraulic structures tends to deflect the water stream from the surf ace and forms a low pressure zone beneath it. Due to low pressure, "cavitation" occurs which is the formation and collapse of vapor bubbles in a liquid. Compared to other methods, air entrainment into the flow to prevent cavitation by an aeration device is effective and more economical. But at present, no standard criteria is available for the design of aeration devices and the space interval between them. In the present study, al together sixteen (16) square type grooves with deflectors were experimentally tested in a steep slope rectangular open chute. Mainly, two sizes of grooves, that is, 5 cm and 7 . 5 cm with square cross-section were chosen and each one was tried with various deflector angles. Air concentration was measured downstream of the device along the centreline of the chute by an air-water concentration meter. A relationship which can help in the assessment of the effectiveness of the square grooves with deflectors was derived using different dimensionless parameters. The design criteria for the selection of spacing between this particular type of aeration device was also established and is valid only within the range of the study.
650		0	_aWater _xAir entrainment
700	0		_aPrida Thimakorn, _eChairperson
700	0		_aTawatchai Tingsanchali, _eExamination Committee
700	1		_aWang, Tsan-Wen, _eExamination Committee
710	2		_aCanadian International Development Agency, _eScholarship Donor
810	2		_aAsian Institute of Technology. _tThesis ; _vno. WA-86-5
856			_3Full-Text _uhttp://203.159.5.9/ait-thesis/detail.php?q=B19781
907			_a.b10063754 _bmnait _cs
902			_a240409
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