서지주요정보
재분산판이 있는 이중 기포 탑에서 기포와 혼합특성 = Bubble properties and mixing characteristics in an airlift bubble column with redistributor
서명 / 저자 재분산판이 있는 이중 기포 탑에서 기포와 혼합특성 = Bubble properties and mixing characteristics in an airlift bubble column with redistributor / 최근호.
저자명 최근호 ; Choi, Keun-Ho
발행사항 [서울 : 한국과학기술원, 1986].
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소장정보

등록번호

4103617

소장위치/청구기호

학술문화관(문화관) 보존서고

MCE 8630

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초록정보

Bubble properties and mixing characteristics were investigated in an Airlift Bubble column with an internal circulation of liquid. In order to reduce the high circulation velocity and obtain a redispersion of coalesced gas bubbles, two types of redistributor ( sieve and disk ) were used in this work. They were installed in a draft tube, 50cm above the bottom and their free surface areas were varied 6.5, 13, 19.5, 26% respectively. The effects of gas velocity ( 2-20cm/s ), liquid velocity ( 0-2cm/s ), and presence of redistributor on mixing time and circulation time have been determined by the salt( KCl )-base-impulse method, and local holdup in each section of the airlift column was measured by manometric technique. The effects of operating variables on bubble properties at different bed height ( 30 - 105 cm ) have been determined by using an electro-resistivity probe method. The experimental results in the present investigations can be summarized as follows; (1) The presence of redistributor not only increased the gas holdup in the draft tube, mixing time and circulation time but also decreased bubble sizes. The experimental correlation can be described as follows; ε_d = $0.020 (exp (-0.077 U_L)) U_G^{0.731} (A_f/A_d)^{-0.182}$ t_c = $6.514 (exp (0.037 U_L)) U_G^{-0.275} (A_f/A_d)^{-0.895}$ t_m = $38.245 (exp (0.001 U_L)) U_G^{-0.168} (A_f/A_d)^{-0.532}$ (2) Without redistributor the vertical bubble length and its rising velocity increased with gas velocity and height, but decreased slightly with liquid velocity. L = $0.610 U_L^{-0.033}; U_G^{0.438} H^{0.101}$ U_b = $84.521 U_L^{-0.006} U_G^{0.219} H^{0.056}$ (3) The pressure drop for co-current upward bubbly air-water flow through various sieve plates has been measured. The discharge coefficient was estimated to be from 0.61 to 0.75 over a range of gas void fraction, 0. - 0.3. (4) The Disk type of redistributor is effective to redisperse coalesced bubbles than the sieve type, especially, the disk type with 19.5% free surface area has given the best result.

서지기타정보

서지기타정보
청구기호 {MCE 8630
형태사항 vi, 98 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 수록
저자명의 영문표기 : Keun-Ho Choi
지도교수의 한글표기 : 이원국
지도교수의 영문표기 : Won-Kook Lee
학위논문 학위논문(석사) - 한국과학기술원 : 화학공학과,
서지주기 참고문헌 : p. 86-88
주제 Hydrodynamics.
기포탑. --과학기술용어시소러스
유체 역학. --과학기술용어시소러스
Bubble chambers.
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