The transient null point calorimeter was first developed by Powars
et al.[9]in 1972 and has been widely used to measure transient
heat fluxes due to its simplicity, very wide flux range and favorable response time characteristics. Löhle et al.[10–12]made some
* Corresponding author. Tel.: 86 10 62786006; fax: 86 10 62786006.
E-mail address:trfu@mail.tsinghua.edu.cn(T. Fu).
http://dx.doi.org/10.1016/j.applthermaleng.2016.02.043