摘要
研究了用于估算纳米流体、盐水溶液和某洗涤剂基试验介质淬火烈度的Grossmann法和集中热容(LHC)法的适用性,评价了探头截面厚度对不同淬火介质换热系数的影响。借助于计算机分析了304不锈钢探头在淬火过程中的冷却曲线,并分别采用Grossmann法和LHC法对所测得的冷却曲线进行了换热系数的估算。研究表明,采用10 mm不锈钢探头的LHC法适用于淬火烈度小于20 m-1介质的表征。虽然Grossmann法是基于平均换热系数这一假设的,但仍能应用于具有不同淬火烈度介质之间的评定。Grossmann法能更敏感地反映探头截面厚度对换热的影响。
The suitability of Grossmann and lumped heat capacitance （ LHC ） methods for estimation of quench severity of nanofluids , brine solutions and a laboratory detergent based medium was investigated .The study involved the assessment of the effect of section thickness of the probe on heat transfer coefficients for different quench media .Computer aided cooling curve analysis during quenching of type 304 stainless steel probes was carried out .The measured thermal history data were used to estimate heat transfer coefficients by Grossmann and LHC methods .The LHC method based on a 10 mm diameter stainless steel probe was found to be applicable for characterizing media having quench severity less than 20 m-1 .Although Grossmann method is based on the concept of average heat transfer coefficient , it can be used for quench media having varying severity of quenching . Grossmann method is found to be more sensitive to the effect of section thickness on heat transfer .
出处
《热处理》
CAS
2013年第5期49-54,共6页
Heat Treatment
