A Study on Heat Trasfer Characteristics of Smooth and Ribbed Tubes for Boiler

보일러용 裸管 및 리브붙이管 의 熱傳達 特性 에 관한 硏究

Heat transfer characteristics in terms of the tube wall-temperature and the enthalpy have been investigated utilizing ribbed (rifled) tubes in order to enhance heat transfer performance. Considerations were given for the cases of smooth tubes in order to compare with the case of ribbed tubes. The tilt angle of the experimental tubes are from 0.deg. to 90.deg. , in order to simulate the boiler water tubes having 15.deg.-90.deg. inclined angle in boiler nose and studded tubes (burner zones), Natural convection and forced convection (Re=1810) conditions were considered in the experiments. The experimental results for the effect for the tube inclination through a natural convection and forced convection are presented and it is shown that ribbed tubes permit an appreciable increase in heat transfer coefficients and consequently it means substantial reductions in boiler water wall tubes and heat exchanger surface areas.

본 논문에서는 자연 및 강제순환 모두를 실험 했으며 사용한 리브붙이 관은 관의 두께와 직경, 리브수, 리브 피치(Pitch), 높이 및 폭등을 사용 하려는 열교환기 나 보일러에 합당하도록 설계, 선정하면, 그 적용 범위는 매우 넓다고 생각돼 연구 검 토 하고자 한다.