Investigation On Mechanism And Performance Of Heat Transfer In Oscillating Heat Pipes

The packaging and thermal management of electronic equipment has become an important issue because of increased power levels and the simultaneous miniaturization of the devices With the characteristics of simple structure, cost effective, compact, reliable, flexible and high performance, oscillating heat pipes (OHPs) are considered one of the most promising cooling devices, so that have attracted deep concern of companies, universities and research institutes all over the world since 1990s. Different from conventional heat pipes, OHPs transfer heat combining latent heat, sensible heat and expansion work. The two-phase system which embodies multi-disciplinary physics is so complicated that the investigation on OHPs is still at a primary stage.This dissertation is focused on the topic of Mechanism and Performance of Heat Transfer in OHPs, including relationships between factors and performance, evaluation methods of heat transfer performance, and inherent interrelation of oscillating flow, heat transfer and mass transfer in OHP system. Being the fundamental research for applications, the dissertation has introduced experimental design and statistical knowledge to study the multivariate analysis on the performance of OHPs, has improved the mass and heat transfer characteristics of film steady evaporation in capillary-scale channels, has developed basic conservation governing equations of mass, heat and momentum for the OHP model and explained the heat transfer mechanism elementarily, has deducted the qualitative expression of equivalent thermal conductivity of OHPs for the first time, and has presented the method of solving inverse problem to investigate the equivalent conductivity quantitatively,.The main contents are listed as follows:(1) OHPs'heat transfer performance is affected by many factors, and the form of the relationship between the performance and the factors is complex and non-linear. To make the relationship clear, first, confirm the object factors and investigated ranges. Then, suppose that the relationship between performance and factors would approximate a second-order model, and use the central composite design to arrange experiments. And then, estimate the...