强化换热管流体侧污垢热阻优化模型  

An Improved Model for Liquid-Side Fouling Thermal Resistance in Enhanced Tubes

作　　者：王源 赵子龙 汤振博 雷卓宇 沈朝 WANG Ynan;ZHAO Zi-Long;TANG Zhen-Bo;LEI Zhuo-Yu;SHEN Chao(School of Architecture, Harbin Institute of Technology, Heilongjiang Cold Region Urban-Rural Human Settlements Science Key Laboratory, Harbin 150001, China)

机构地区：[1]哈尔滨工业大学建筑学院黑龙江省寒地城乡人居环境科学重点实验室,哈尔滨150001

出　　处：《工程热物理学报》2018年第7期1512-1517,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.51606049)

摘　　要：常规污垢热阻预测模型把颗粒附着概率和污垢粘合强度认为是常数,但本文分析发现其不能以常数处理。基于Li和Webb的污垢实验数据,针对内螺纹强化换热管提出了一种理论更合理的污垢预测模型。新模型与现有模型相比不仅具有直接的实际物理意义,而且具有较高准确度,其最大偏差、平均偏差分别为5.20%、1.87%。常规模型为了保证一定的精度,只能以p/e≈3.5为分界点进行分段函数预测,而新模型公式单一简便、物理意义明显。该模型可供后续的强化管污垢热阻研究提供一种更优的建模方法。Sticking probability and deposit bond strength were considered to be constant in the previous fouling prediction models, which turned out to be problematic in the latest study.A theoretical model of fouling in internal helical-rib tubes, which is more theoretically reasonable,was developed in this paper based on the long-term fouling data reported by Li and Webb, targeting to improve previous fouling models. Compared with previous models, the results show that the new model has both a direct physical significance and a higher accuracy with a maximum deviation of 5.20% and an average deviation of 1.87%. In order to ensure precision, the previous models can only predict the segmentation function with p/e around 3.5. While the new method prestented in this paper, with simple formulas and clear physical meanings, provides a better modeling method for the follow-up study in the field of thermal resistance of enhanced fouling tubes.

关 键 词：强化换热管 污垢模型 附着概率 热阻 偏差 

分 类 号：TU831.6[建筑科学—供热、供燃气、通风及空调工程]