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Investigations into the convective transport of heat in porous materials are of interest for many applications in connection with the problem of increasing the efficiency of thermal insulation.


The acceleration of the mixing of the solute considered in these models in the presence of the simultaneous influence of molecular diffusion and convective transport also operates in unsteady flows.


The stratum is assumed to be thin, and the treatment is limited to the case of the largescale approximation [1], for which the main mechanism of heat transport in the stratum is convective transport.


In the present paper, the hydrodynamic velocity field of the fluid, and also the change in the integrated diffusion flux due to the convective transport of the ions are found in the linear approximation in the small parameter ? = d/R1.


Convective transport of combustion products in the atmosphere above large fires

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 The general equation of transfer function model (TFM) developed by Jury et al is simplified in this paper and a simplified equation of TFM is introduced suitable for studying the salt movements under infiltration. The travel time probability distribution function P(t) and its density function g(tt'), describing salt movements through soil layers of 060cm, are obtained from the simplified equation for irrigation water with different salinities in the field. Some parameters such as average travel time t of salt,... The general equation of transfer function model (TFM) developed by Jury et al is simplified in this paper and a simplified equation of TFM is introduced suitable for studying the salt movements under infiltration. The travel time probability distribution function P(t) and its density function g(tt'), describing salt movements through soil layers of 060cm, are obtained from the simplified equation for irrigation water with different salinities in the field. Some parameters such as average travel time t of salt, average velocity v in pores, average water content of movable water θm, describing the charateristics of unsaturated water movement and convection transport of salt in soil layers are obtained. Some theoretical shortcomings in this research are also pointed out.  本文首先对Jury等的TFM一般方程进行了简化,导出了适于研究在入渗条件下描述盐分对流运移的TFM简化方程;根据田间高低不同矿化度水灌溉入渗试验结果和上述简化方程,得到了盐分通过0—60cm土层的时间概率分布函数P(t)及其相应的密度函数g(t—t’),同时还推求出有关描述土壤水非饱和流动和盐分对流运移特征的参数:如盐分通过所研究土层的平均时间t、水分在土壤孔隙中的平均流速V、土体中可动水体的平均含水率θ_m等,并对这些参数进行分析和讨论;最后指出了本文在理论方面的不足之处和尚待进一步探讨的问题.  This paper has mainly discussed the similarities and differences between oil pools and gas pools in the respects of hydrocarbon sources,reservoir properties,migration and accumulation mechanisms,and preserving conditions.As mineral deposits,both oil and natural gas pools have similar conditions for the formation and preservation;they need hydrocarbons concentrations by migration and relative stable preserving conditions,etc.Compared with oil pools,gas pools have many particular properties,such as multiple gas... This paper has mainly discussed the similarities and differences between oil pools and gas pools in the respects of hydrocarbon sources,reservoir properties,migration and accumulation mechanisms,and preserving conditions.As mineral deposits,both oil and natural gas pools have similar conditions for the formation and preservation;they need hydrocarbons concentrations by migration and relative stable preserving conditions,etc.Compared with oil pools,gas pools have many particular properties,such as multiple gas sources,combination of varity of gases,lower standard of reservoirs and higher standard of cap rocks,etc.Because natural gas can easily migrate and has many states of migration,there are many formation mechanisms for the gas pools;convection migration of gas and the separation of dissolved gas may be an important migration and formation mechanism for the gas pools.  作为流体矿藏 ,气藏与油藏的形成和分布具有相似性 ,都需要经过由分散到富集的成藏过程。天然气来源的广泛性和易于溶解、运移、散失的特性 ,决定了天然气比石油具有更多的运聚成藏方式和时空分布的广泛性。水溶对流运移、多源复合成藏、溶解气脱溶成藏、运聚动平衡成藏 ,是天然气运聚成藏的重要特点  The ventilation of a long highway tunnel is one of the concerns of highway builders.This ventilation process is also the movement of the pollutants in the wind.The latter mainly includes the forms of molecular diffusion, convective movement, turbulent current diffusion and attenuating transformation.By the law of conservation of quality, the diffusion equations of pollutant movement and pollutant turbulence can be followed.These diffusion equations,wind flow equation, boundary conditions and primary conditions... The ventilation of a long highway tunnel is one of the concerns of highway builders.This ventilation process is also the movement of the pollutants in the wind.The latter mainly includes the forms of molecular diffusion, convective movement, turbulent current diffusion and attenuating transformation.By the law of conservation of quality, the diffusion equations of pollutant movement and pollutant turbulence can be followed.These diffusion equations,wind flow equation, boundary conditions and primary conditions contribute to the convection of the mixture of pollutants and air,the equation of diffusive mathematics mechanics.Finally,the one dimensional theory under the regularly given conditions is analyzed and the practical example is calculated, the results show that the simulating calculation of the pollutant movement in the wind in a long highway tunnel only needs the consideration of convection movement and turbulent current diffusion.5 refs.  公路长隧道通风问题是公路建设者们所关心的问题之一。隧道通风过程同时也是污染物在风流中的运移过程 ,污染物在风流中的运移主要包括分子扩散、对流运移、紊流扩散、衰减转化四种形式。据质量守恒定理 ,分别推导出了污染物移流扩散方程和污染物紊流扩散方程。扩散方程、风流流动方程、边界条件及初始条件便构成了污染物、空气二元混合气体的对流—扩散的数学力学方程。最后进行了在定常条件下的一维理论分析和实例计算 ,结果表明进行公路长隧道风流中的污染物运移模拟计算时 ,只需考虑污染物移流和紊流扩散  
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