Thermal radiators with embedded pulsating heat pipes: Infra-red thermography and simulations

A novel design of pulsating heat pipe with fewer turns applicable to all orientations

“…This is mainly attributed to a higher circulation rate of the working fluid which results in heat transfer enhancement. At a lower heat input, gravity adversely affected the performance and only intermittent pulsations (periodic 'start-stop' behavior as described by Yang et al [3]) were observed (Hemadri et al [13]). On the other hand, the thermal driving forces could overcome the adverse effect of gravity with further addition of heat, leading to performance improvement and self-sustained pulsations.…”

Infrared analysis of the two phase flow in a single closed loop pulsating heat pipe

“…As already pointed out by Hestroni et al, 2011, care must be taken because of the numerous external radiation sources may alter the measurements. IR analysis was used in recent studies to measure quantitatively the external PHP wall temperatures (Hemadri et al, 2011;Liu et al, 2012, Karthikeyan et al, 2013Karthikeyan et al, 2014;Chauris et al, 2015). Nevertheless, a direct IR analysis of the fluid may be able to detect the liquid interface temperature and even the liquid film dynamics within the PHP tube.…”

Radioisotope Thermophotovoltaic Generator Design Methods and Performance Estimates for Space Missions

“…The higher end of the required thermal conductivity is achievable with more advanced technologies. For example, the pulsed heat pipe design by Hemadri et al [41] showed an effective conductivity as high as 900 -2,500 W/mK. The liquid droplet or liquid sheet radiator can achieve a specific power larger than 1,000 W/kg easily [42].…”