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水平管內 液狀 流動層에서 縣濁粒子에 의한 熱傳達速度 增進에 관한 硏究
변인섭,김용옥 慶熙大學校 1994 論文集 Vol.23 No.-
Double pipe heat exchanger consisted of aluminium and acrylic pipes were constructed to study the characteristics of heat transfer between wall and slurry (Titanium Dioxide, sodium chloride - water suspension) flowing through the horizontal pipes. Experiments were conducted in the ranges, slurry velocity of 600-2400ml/min, weight fraction of particles from 0 to 0.1, and surrounding temperature at 50℃, 70℃ and 90℃ respectively. It was found that the rate of heat transfer in the suspension was larger than that of the simple water flow. The rate of heat transfer increased in the suspension as the velocity of slurry and weight fraction of particle increases, and surrounding temperture in the flow system. The results were as follows 1. The value of heat transfer coefficient is 580W/㎡℃ in the titanium dioxide suspension at concentration 9%, velocity of suspension 2400ml/min and surrounding temperature at 90℃ respectively. It was found that the rate of heat transfer coefficient in the slurry flow was about 1.3 times larger than that of the simple water flow. 2. The value of heat transfer coefficient is 570W/㎡℃ in the kaolin suspension at concentration 9%, velocity of suspension 2400ml/min and surrounding temperature at 90℃ respectively. It was found that the rate of heat transfer coefficient in the slurry flow was about 1.2 times larger than that of the simple water flow. 3. The value of heat transfer coefficient is 850W/㎡℃ in the NaC1 solution at concentration 9%, velocity of suspension 2400ml/min and surrounding temperature at 90℃ respectively. It was found that the rate of heat transfer coefficient in the NaC1 solution was about 2.5 times larger than that of the simple water flow. A heat transfer model was proposed to explain this behavior, assuming that the particle with its clinging film of liquid was in contact with the aluminium pipe and was rotating parallel to the pipe surface. The proposed model explained the augmentation of heat transport by means of the flow of suspended particles.
水平管內 液狀 流動層에서 懸濁粒子에 의한 熱傳達速度 增進에 관한 硏究
변인섭,강호출,김운수,김용욱 慶熙大學校 大學院 1994 高凰論集 Vol.14 No.-
Double pipe heat exchanger consisted of aluminium and acrylic pipes were constructed to study the characteristics of heat transfer between wall and slurry (Titanium Dioxide, Kaolin water suspension) flowing through the horizontal pipes. Experiments were conducted in the ranges, slurry velocity of 600-2400ml/min, weight fraction of particles from 0 to 10, and surrounding temperature 50℃, 70℃ and 90℃ respectively. 1. The value of heat transfer coefficient is 580W/m2℃ in the titanium dioxide suspension at concentration, 9%, velocity of suspension 2100ml/min and surrounding temperature 90℃ respectively. It was found that the rate of heat transfer coefficient in the slurry flow was about 1.3 magnification larger than that of the simple water flow. 2. The value of heat transfer coefficient is 570W/m2℃ in the kaolin suspension at concentration 9%, velocity of suspension 2400ml/min and surrounding temperature 90℃ respectively. It was found that the rate of heat transfer coefficient in the slurry flow was about 1.2 magnification larger than that of the simple water flow. A heat transfer model was proposed to explain this behavior, assuming that the particle with its clinging film of liquid was in contact with the aluminium pipe and was rotating parallel to the pipe surface. The proposed mode, explained quantitatively the augmentation of heat transport by means of the flow of suspended particles.