A transient hot-wire method for measuring the thermal conductivity of gases and liquids

A Performance Evaluation of Environmentally Acceptable Foam Blowing Agents

“…Table 2 is the thermal conductivity of the blowing agent vapor; thermal conductivity data versus temperature are also plotted in Figure 1. These results were obtained using a transient hot wire technique [3] and are believed accurate to ±2%. One of the principal reasons that rigid polyurethane and polyisocyanurate foams possess excellent thermal insulation characteristics is that CFC-11 itself has a low vapor thermal conductivity.…”

Development and Testing of Experimental Methods Definition of Thermal Conductivity of Nanofluids

“…Принцип измерения теплопроводности методом нагреваемой нити [6][7] основан на линей-ной зависимости между ростом температуры нити и логарифмом времени нагрева. В гомоген-ную исследуемую жидкость погружается нить, по ней пропускается постоянный электриче-ский ток, тепловой поток на нити постоянный.…”

“…Данная методика была разработана на основе известного нестационарного метода нагреваемой нити [6][7], c мостовой схемой Уитстона, который используется для определения коэффициента теплопроводности жидкостей.…”

Blowing Agents: The Next Generation

“…Hence, the likely liquid candidates are some of the HFC-245 and HFC-236 isomers. The vapor thermal conductivity of most of these species as well as HFC-356 have been measured at about 44°C using a transient hot wire apparatus [12]. The results of these measurements, summarized in Table 11, indicate that none of these candidates is as efficient thermal insulation gas as HCFC-141b.…”