In this paper, a simple and effective method is presented to solve the two-dimensionalnonlinear steady inverse heat conduction problem. From the finite difference equation of heatconduction, the convective heat transf...In this paper, a simple and effective method is presented to solve the two-dimensionalnonlinear steady inverse heat conduction problem. From the finite difference equation of heatconduction, the convective heat transfer coefficient, which is the unknown boundary, can benumerially obtained with this method. By taking the electrically heated helically coiled tubeas an experimental case, this method is successfully applied. It is proved by numerical teststhat this method takes the advantages of fast coverging, high precision and good stability.It can also be extended to the complex geometrics problems.展开更多
Understanding the steady mechanism of biomass smoldering plays a great role in the utilization of smoldering technology.In this study numerical analysis of steady smoldering of biomass rods was performed.A two-dimensi...Understanding the steady mechanism of biomass smoldering plays a great role in the utilization of smoldering technology.In this study numerical analysis of steady smoldering of biomass rods was performed.A two-dimensional(2D)steady model taking into account both char oxidation and pyrolysis was developed on the basis of a calculated propagation velocity according to empirical correlation.The model was validated against the smoldering experiment of biomass rods under natural conditions,and the maximum error was smaller than 31%.Parameter sensitivity analysis found that propagation velocity decreases significantly while oxidation area and pyrolysis zone increase significantly with the increasing diameter of rod fuel.展开更多
文摘In this paper, a simple and effective method is presented to solve the two-dimensionalnonlinear steady inverse heat conduction problem. From the finite difference equation of heatconduction, the convective heat transfer coefficient, which is the unknown boundary, can benumerially obtained with this method. By taking the electrically heated helically coiled tubeas an experimental case, this method is successfully applied. It is proved by numerical teststhat this method takes the advantages of fast coverging, high precision and good stability.It can also be extended to the complex geometrics problems.
文摘Understanding the steady mechanism of biomass smoldering plays a great role in the utilization of smoldering technology.In this study numerical analysis of steady smoldering of biomass rods was performed.A two-dimensional(2D)steady model taking into account both char oxidation and pyrolysis was developed on the basis of a calculated propagation velocity according to empirical correlation.The model was validated against the smoldering experiment of biomass rods under natural conditions,and the maximum error was smaller than 31%.Parameter sensitivity analysis found that propagation velocity decreases significantly while oxidation area and pyrolysis zone increase significantly with the increasing diameter of rod fuel.
