This study aims to optimize the influence of the inlet inclination angle on the Indoor Air Quality(IAQ),heat,and temperature distribution in mixed convection within a two-dimensional square cavityfilled with an air-CO...This study aims to optimize the influence of the inlet inclination angle on the Indoor Air Quality(IAQ),heat,and temperature distribution in mixed convection within a two-dimensional square cavityfilled with an air-CO_(2)mixture.The air-CO_(2)mixture enters the cavity through two inlet openings positioned at the top wall,which is set at the ambient temperature(TC).Three values of the Reynolds numbers,ranging from 1000 to 2000,are considered,while the Prandtl number is kept constant(Pr=0.71).The temperature distribution and streamlines are shown for Rayleigh number(Ra)equal to 104,three inlet inclination anglesϕ(0,π/6 andπ/4)and three CO_(2)concentrations values(1500,2500,3500 ppm)applied at both hot vertical walls(maintained at a constant temperature TH).Afinite volume method is used under the assumption of two-dimensional laminarflow to solve the NavierStokes and energy equations.The results indicate that inlet inclination angle has an impact on the indoor air quality(IAQ),which,in turn,affects the heat transfer distribution and thermal comfort within the cavity.展开更多
Gas blowout occurred during drilling may cause catastrophic environmental hazards and economic losses.It is thus one of the important tasks to accurately determine the gas blowout volume so that an effective rescue pl...Gas blowout occurred during drilling may cause catastrophic environmental hazards and economic losses.It is thus one of the important tasks to accurately determine the gas blowout volume so that an effective rescue plan can be worked out in case of gas blowout.In this paper,a numerical method for estimating the gas blowout volume was presented based on the Bernoulli Equation and the corresponding software was programmed.In the process of numerical estimation,the velocity distribution of the blowoutflame characterized by the axisymmetric laminarflow was investigated through an analysis of the dynamicflowing features of the gas gusher,and the relationship between the gas production of a well and the height of the blowoutflame was then analyzed with the Bernoulli Equation to obtain the numerical results of the gas blowout volume.The results were then compared with those laboratory measurements,and the software was revised based on the comparisons.Some conclusions were drawn.First,when the spout shape of a gusher is constant,the gas production is proportional to the height of the blowoutflame,and inversely proportional to the gas kinematic viscosity,the stoichiometric ratio factor and the oxygen concentration.Second,the errors be-tween the results estimated using the revised software and the laboratory measurements are within the allowable range,and the software can automatically generate a report.In a word,the method and software presented in this paper can be an effective technique for preparing a sound and safe rescue plan in case of gas blowout,and is of great significance in relieving the hazards of a well with uncontrolled blowout.展开更多
文摘This study aims to optimize the influence of the inlet inclination angle on the Indoor Air Quality(IAQ),heat,and temperature distribution in mixed convection within a two-dimensional square cavityfilled with an air-CO_(2)mixture.The air-CO_(2)mixture enters the cavity through two inlet openings positioned at the top wall,which is set at the ambient temperature(TC).Three values of the Reynolds numbers,ranging from 1000 to 2000,are considered,while the Prandtl number is kept constant(Pr=0.71).The temperature distribution and streamlines are shown for Rayleigh number(Ra)equal to 104,three inlet inclination anglesϕ(0,π/6 andπ/4)and three CO_(2)concentrations values(1500,2500,3500 ppm)applied at both hot vertical walls(maintained at a constant temperature TH).Afinite volume method is used under the assumption of two-dimensional laminarflow to solve the NavierStokes and energy equations.The results indicate that inlet inclination angle has an impact on the indoor air quality(IAQ),which,in turn,affects the heat transfer distribution and thermal comfort within the cavity.
文摘Gas blowout occurred during drilling may cause catastrophic environmental hazards and economic losses.It is thus one of the important tasks to accurately determine the gas blowout volume so that an effective rescue plan can be worked out in case of gas blowout.In this paper,a numerical method for estimating the gas blowout volume was presented based on the Bernoulli Equation and the corresponding software was programmed.In the process of numerical estimation,the velocity distribution of the blowoutflame characterized by the axisymmetric laminarflow was investigated through an analysis of the dynamicflowing features of the gas gusher,and the relationship between the gas production of a well and the height of the blowoutflame was then analyzed with the Bernoulli Equation to obtain the numerical results of the gas blowout volume.The results were then compared with those laboratory measurements,and the software was revised based on the comparisons.Some conclusions were drawn.First,when the spout shape of a gusher is constant,the gas production is proportional to the height of the blowoutflame,and inversely proportional to the gas kinematic viscosity,the stoichiometric ratio factor and the oxygen concentration.Second,the errors be-tween the results estimated using the revised software and the laboratory measurements are within the allowable range,and the software can automatically generate a report.In a word,the method and software presented in this paper can be an effective technique for preparing a sound and safe rescue plan in case of gas blowout,and is of great significance in relieving the hazards of a well with uncontrolled blowout.
