tailieunhanh - HEAT TRANSFER THEORETICAL ANALYSIS, EXPERIMENTAL INVESTIGATIONS AND INDUSTRIAL SYSTEMS_2

Tham khảo sách 'heat transfer theoretical analysis, experimental investigations and industrial systems_2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Part 2 Boiling Freezing and Condensation Heat Transfer 8 Nucleate Pool Boiling in Microgravity Jian-Fu ZHAO Key Laboratory of Microgravity National Microgravity Laboratory CAS Institute of Mechanics Chinese Academy of Sciences CAS China 1. Introduction Nucleate pool boiling is a daily phenomenon transferring effectively high heat flux. It is however a very complex and illusive process because of the interrelation of numerous factors and effects as the nucleate process the growth of the bubbles the interaction between the heater s surface with liquid and vapor the evaporation process at the liquidvapor interface and the transport process of vapour and hot liquid away from the heater s surface. Among many sub-processes in boiling phenomenon gravity can be involved and play much important roles even enshroud the real mechanism underlying the phenomenon. Our present knowledge on nucleate pool boiling phenomenon has been built with the aid of numerous meticulous experiments in normal gravity environment on the ground where gravity is a dominant factor. Gravity strongly affects boiling phenomenon by creating forces in the systems that drive motions shape boundaries and compress fluids. Furthermore the presence of gravity can mask effects that ever present but comparatively small. Advances in the understanding of boiling phenomenon have been greatly hindered by masking effect of gravity. Microgravity experiments offer a unique opportunity to study the complex interactions without external forces such as buoyancy which can affect the bubble dynamics and the related heat transfer. Furthermore they can also provide a means to study the actual influence of gravity on the boiling. On the other hand since many potential applications exist in space and in planetary neighbours due to its high efficiency in heat transfer pool boiling in microgravity has become an increasing significant subject for investigation. Therefore the microgravity researches will be conductive to revealing

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