Experimental Study on Coefficient of Flow Convection Jeon, Sang-Eun; Kim, Kook-Han; Kim, Jin-Keun; Yang, Joo-Kyoung;
Pipe cooling method is widely used for reduction of hydration heat and control of cracking in mass concrete structures. However, in order to effectively apply pipe cooling systems to concrete structures, the coefficient of flow convection relating the thermal transfer between inner stream of pipe and concrete must be estimated. In this study, a device measuring the coefficient of flow convection was developed. Since a variation of thermal distribution caused by pipe cooling has a direct effect on internal forced flows, the developed testing device is based on the internal forced flow concept. Influencing factors on the coefficient of flow convection are mainly flow velocity, pipe diameter and thickness, and pipe material. Using experimental results from the developed device, the coefficient of flow convection was calculated. Finally, a general prediction model was proposed by theoretical procedures. The proposed prediction model is able to estimate the coefficient of flow convection with flow velocity and material properties of pipe. From comparison with experimental results, the coefficient of flow convection by this model was well agreed with those by experimental results.
pipe cooling system;coefficient of flow convection;thermal transfer;internal flow;
E. Gaufhier and M Regourd, 'The Hardening of Cement in Function of Teiwerature,' Proceedings, RILEM Intermtional Conference on Concrete at Earty Ages, Pahs, Ecole National des Ponts et Chausses, Vol. 1, 1982
오병환, 신경준, 차수원, '매스 콘크리트 구조물의 파이프 쿨링에 의한 냉각효과', 한국콘크리트학회 봄학술발표회 논문집, Vol. 11, No. 1, 1999. pp299-304