단상 모델을 이용한 알루미나/물 나노유체 열전달 특성에 관한 수치해석
Numerical analysis on heat transfer characteristics of alumina/water nanofluid using a single-phase model
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초록
본 연구에서는 단상 모델 접근법을 이용하여 나노유체의 열전달 특성에 관한 수치해석적 연구를 수행하였다. 수치해석은 기존에 수행된 실험적 연구를 기반으로 진행되었다. 나노유체는 직경 10-20nm의 0.5vol%, 1.0vol% 알루미나/물이며, 길이 1m, 내경 7mm 원관에서의 열전달 특성을 분석하였다. 원관 벽면에 일정한 열유속 9000가 적용되었으며, 레이놀즈수 470에서 1900 범위에서 수행되었다. 입구 측에서는 높은 열전달 계수가 나타났으며, 출구 측으로 갈수록 열전달 계수는 감소하였다. 그리고 레이놀즈수가 증가할수록 열전달 계수는 증가하였다. 전반적으로 수치해석에 의한 결과는 실험 결과를 잘 예측하였다. 1vol%의 나노유체에서 열전달 계수는 물에 비해서 최대 15% 증가하였다.
Abstract
A numerical study on the heat transfer characteristics of nanofluid was conducted using a single-phase model. The numerical analysis was performed based on a previous experimental study. The nanofluids were Al2O3/water with particle sizes of 10 to 20 nm and particle concentrations of 0.5 and 1 vol%. The heat transfer characteristics were analyzed in a tube having a length and inner diameter of 1 m and 7 mm, respectively. A constant heat flux of 9000 was applied at the tube wall, and the Reynolds number ranged from 470 to 1900. Consequently, high heat transfer coefficients were obtained at the inlet region. The heat transfer coefficients decreased as the nanofluid flowed to the outlet region, but increased as the Reynolds number increased. The numerical results generally agreed with the experimental results. The heat transfer coefficient of the nanofluid with 1.0 vol% increased up to 15%.
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