Two Phase Flows: Hydrodynamics and Heat-and-Mass Transfer (Based on the Materials of IHTC 16 and RNKT-7 Conferences)

Аннотация

A review of the results from experimental and theoretical studies on fundamental, scientific, technical, and applied orientation are presented for two-phase flows with different structures according to materials of two significant and already traditional scientific forums: the Russian National Conference on Heat Transfer (RNKT-7) and the International Heat Transfer Conference (IHTC 16). Particular attention therein was paid to the classification of gas-liquid and vapor-liquid flows, bubble flows, gas-droplet and gas-dust (gas + solid particles) structures, and plotting flow-pattern diagrams for flowing both in the channels of traditional shape and size and in minichannels of a capillary type. Problems are considered concerning the hydrodynamics and heat-and-mass transfer, increasing heat-transfer efficiency under cooling heated solid surfaces by impact jets. Modern noncontact optical experimental methods for measuring the local characteristics of flows are described in detail, which make it possible to determine, for example, phase slip coefficients, local gas (vapor) content, liquid film thickness, especially in the areas of triple phase contact, etc. Theoretical approaches are also considered wherein analytical and numerical methods are used to describe the stability of bubble and film flows, cavitation phenomena, acoustics, and the gas dynamics of two-phase flows, including gas + solid particles. A significant number of reports are devoted to the urgent problems of power engineering, chemical technologies, studies on heat-and-mass transfer in cooling towers, cryogenic equipment under regasification, absorbers, jet cooling systems for heat-transfer surfaces, snow generators, and ultra-modern and highly efficient capillary-type heat exchangers.