摘要
螺纹管在工业锅炉及换热器中得到较为广泛的应用。但到目前,尚未能对螺纹管的换热及阻力特性做出完全的数值解,其换热及阻力系数的计算主要还依赖于各种实验所整理出的经验计算式。由于实验的方法,手段及介质的不同,得出不同的经验计算式,这些计算式的形式,适用范围及计算结果都有一定的差异。因此,在选用螺纹管作为锅炉烟管时的热力计算中,采用何种经验计算式,对锅炉烟管的热力计算准确与否有较大的影响。本文对螺纹管的各种经验计算式进行综合评述,以便找出较为合适的,以烟气作为换热介质的螺纹烟管经验计算式。
Because of their simple construction ,ease of fabrication and better heat transfer properties helical-ribbed tubes are used more often in industrial boilers; and heat exchangers than bare tubes. But, up to now it is not possible to perform a complete numerical solution of the helical-ribbed tube heat exchange and resistance characteristics, their calculation being based mainly on empirical formulas obtained from various kinds of experiments. Because of the difference in facilities and working medium employed for the experiments the empirical formulas obtained will also be different, thus resulting in certain deviations as to their form, applicable scope and calculation results. Consequently, the selected empirical formulas for the thermal calculation of boiler flue gas tubes in case of using helical-ribbed tubes will have a significant effect on the accuracy of the boiler flue gas tube thermal calculation. In 晅his paper a comprehensive review is given fo the various empirical formulas for calculating helical-ribbed tubes in order to identify a relatively suitable empirical formula for helical-ribbed tubes when flue gas is used as a heat exchange medium.
出处
《热能动力工程》
CAS
CSCD
北大核心
1996年第6期369-374,共6页
Journal of Engineering for Thermal Energy and Power
关键词
螺纹管
换热
锅炉
计算
helical-ribbed tube, heat exchange
