The similarity criterion for water flooding reservoir flows is concerned with in the present paper. When finding out all the dimensionless variables governing this kind of flow, their physical meanings are subsequentl...The similarity criterion for water flooding reservoir flows is concerned with in the present paper. When finding out all the dimensionless variables governing this kind of flow, their physical meanings are subsequently elucidated. Then, a numerical approach of sensitivity analysis is adopted to quantify their corresponding dominance degree among the similarity parameters. In this way, we may finally identify major scaling law in different parameter range and demonstrate the respective effects of viscosity, permeability and injection rate.展开更多
Dimensionless variable groups(DGs)of free-fall grain dryer were developed by using the characteristic scaling method and engineering intuition.These DGs were intended for the analyses of drying characteristics and siz...Dimensionless variable groups(DGs)of free-fall grain dryer were developed by using the characteristic scaling method and engineering intuition.These DGs were intended for the analyses of drying characteristics and sizes of this dryer.Experiments of the free-fall rough rice dryer were carried out using different drying chambers(small and medium scales),drying air temperatures(100°C-150°C),and drying air speeds(1-3 m/s).Experimental data were used to study relationships and to validate similarities among these DGs.The results of the study showed the five appropriate dimensionless variables representing and describing the drying mechanism of the free-fall dryer.These DGs could be applied to design and analyze scaling up the dryer.In addition,the dimensionless correlation was established to predict the moisture contents of rough rice while being dried by the free-fall dryer.The predicted values from this correlation were in relatively good agreement with the experimental data under the proposed drying conditions(R2=0.989,MRD=1.82%and RMSE=0.0168).展开更多
In this paper,the assumptions implicited in Leveque’s approximation are re-examined,and the variation of the temperature and the thickness of the boundary layer were illustrated using the developed solution.By defini...In this paper,the assumptions implicited in Leveque’s approximation are re-examined,and the variation of the temperature and the thickness of the boundary layer were illustrated using the developed solution.By defining a similarity variable,the governing equations are reduced to a dimensionless equation with an analytic solution in the entrance region.This report gives justification for the similarity variable via scaling analysis,details the process of converting to a similarity form,and presents a similarity solution.The analytical solutions are then checked against numerical solution programming by FORTRAN code obtained via using Runge-Kutta fourth order(RK4)method.Finally,other important thermal results obtained from this analysis,such as;approximate Nusselt number in the thermal entrance region was discussed in detail.A comparison with the previous study available in literature has been done and found an excellent agreement with the published data.展开更多
基金The project supported by the Innovative Project of CAS (KJCX-SW-L08)the National Basic Research Program of China(973)
文摘The similarity criterion for water flooding reservoir flows is concerned with in the present paper. When finding out all the dimensionless variables governing this kind of flow, their physical meanings are subsequently elucidated. Then, a numerical approach of sensitivity analysis is adopted to quantify their corresponding dominance degree among the similarity parameters. In this way, we may finally identify major scaling law in different parameter range and demonstrate the respective effects of viscosity, permeability and injection rate.
基金This research is sponsored by the Royal Golden Jubilee(RGJ)Ph.D.Program of the Thailand Research Fund(TRF).
文摘Dimensionless variable groups(DGs)of free-fall grain dryer were developed by using the characteristic scaling method and engineering intuition.These DGs were intended for the analyses of drying characteristics and sizes of this dryer.Experiments of the free-fall rough rice dryer were carried out using different drying chambers(small and medium scales),drying air temperatures(100°C-150°C),and drying air speeds(1-3 m/s).Experimental data were used to study relationships and to validate similarities among these DGs.The results of the study showed the five appropriate dimensionless variables representing and describing the drying mechanism of the free-fall dryer.These DGs could be applied to design and analyze scaling up the dryer.In addition,the dimensionless correlation was established to predict the moisture contents of rough rice while being dried by the free-fall dryer.The predicted values from this correlation were in relatively good agreement with the experimental data under the proposed drying conditions(R2=0.989,MRD=1.82%and RMSE=0.0168).
文摘In this paper,the assumptions implicited in Leveque’s approximation are re-examined,and the variation of the temperature and the thickness of the boundary layer were illustrated using the developed solution.By defining a similarity variable,the governing equations are reduced to a dimensionless equation with an analytic solution in the entrance region.This report gives justification for the similarity variable via scaling analysis,details the process of converting to a similarity form,and presents a similarity solution.The analytical solutions are then checked against numerical solution programming by FORTRAN code obtained via using Runge-Kutta fourth order(RK4)method.Finally,other important thermal results obtained from this analysis,such as;approximate Nusselt number in the thermal entrance region was discussed in detail.A comparison with the previous study available in literature has been done and found an excellent agreement with the published data.
