CAJ | 학술논문

在气流中加入颗粒，形成气固两相流。根据气流速度的不同，气固两相流分为鼓泡流态化、快速流态化、气力输送等形式。不同的流动形态，两相流内颗粒浓度及颗粒的运动规律不同，其传热特点也存在差异。通过回顾几种多相流流态的传热特点，总结了多相流与传热面换热的影响因素、气固两相流的传热机理与模型。气固两相流中颗粒浓度、颗粒运动对其传热起决定性作用，而操作参数（气流速度、床层压力、床层温度等）则主要通过改变颗粒浓度和颗粒运动影响传热。此外，通过气固两相流强化传热的应用实例--气固两相流与填充床的热交换，分析了颗粒在对流换热中所起的作用，并进一步提出了今后研究方向和难点所在。
재기류중가입과립，형성기고량상류。근거기류속도적불동，기고량상류분위고포류태화、쾌속류태화、기력수송등형식。불동적류동형태，량상류내과립농도급과립적운동규률불동，기전열특점야존재차이。통과회고궤충다상류류태적전열특점，총결료다상류여전열면환열적영향인소、기고량상류적전열궤리여모형。기고량상류중과립농도、과립운동대기전열기결정성작용，이조작삼수（기류속도、상층압력、상층온도등）칙주요통과개변과립농도화과립운동영향전열。차외，통과기고량상류강화전열적응용실례--기고량상류여전충상적열교환，분석료과립재대류환열중소기적작용，병진일보제출료금후연구방향화난점소재。
By adding particles into a gas flow, a gas-solid flow is formed. As the gas velocity increases, the gas-solid flow shows different patterns as bubbling fluidization, circulating fluidization and pneumatic conveying, in which the concentration of particles and the motion of gas-solid mixture are different, influencing the heat transfer between the gas-solid flow and immersed surface. In this paper, the heat transfer characters of the three flow patterns are reviewed, and the influencing factors, heat transfer mechanism and models are summarized. The concentration of particles and their movement play a decisive role on the heat transfer, and the operating parameters (gas velocity, bed pressure, bed temperature,etc) influence the heat transfer through changing the particle concentration and movement. A case of heat transfer enhancement, the heat exchange between gas-solid mixture and fixed bed, is analyzed. In addition, the future research area and the difficulty are presented.