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비 뉴튼 유체 유동층에서 층팽창 이완 방법에 의한 유동 입자의 분산 거동 해석

Analysis of Dispersion Behavior of Fluidized Particles by Relaxation Method in Fluidized Beds with Non-Newtonian Fluid

강용 나종복 최상원 김상돈

Kang Y Nah JB Choi SW Kim SD

HWAHAK KONGHAK, October 1992, 30(5), 605-611(7), NONE

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Abstract

비 뉴튼 유체(석탄과 CMC 용액의 슬러리)-고체 유동층에서 층팽창 이완 방법에 의해 유동입자의 빈도수와 축방향 분산계수를 구하였으며, 액체의 점도, 액체의 유속, 유동입자의 크기 및 층공극률 등이 유동입자의 분산계수에 미치는 영향을 고찰하였다. 비 뉴특 유체-고체 유동층에 소량의 기체 주입이 유동층 내 유동입자의 분산 거동에 미치는 영향을 또한 고찰하였다. 본 연구의 결과, 유동층 내 유동입자의 분산계수는 액체의 유속과 층곡극률이 증가함에 따라 최대값을 나타냈으며, 유동입자의 크기 및 액체의 점도가 증가함에 따라 증가하였다. 또한 익체-고체 유동층에 소량의 기체주입은 유동입자의 분산계수를 증가시켰다.

Frequency and axial dispersion coefficient of fluidized particles in fluidized beds with non-Newto-nian fluid(coal-CMC solution) were measured by means of relaxation method. Effects of fluid flow rate, liquid viscosity, fluidized particles size and bed porosity on the dispersion coefficient of fluidized particles were determined. Effects of the injection of small amount of gas into the fluidized beds with non-Newtonian fluid on the dispersion coefficient of fluidized particles were also discussed. From the results of this study, the frequency and dispersion coefficient of fluidized particles exhibited their maxima with increases in fluid flow rate and bed porosity, and those values increased with increases in particles size and liquid viscosity. The injection of small amount of gas into the liquid-solid fluidized beds could increase the frequency and dispersion coefficient of fluidzed particles.

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