Modeling of liquid metal flow and heat transfer in delivery tube during gas atomization
نویسندگان
چکیده
A numerical model is developed to describe the flow and heat transfer behavior of liquid metals in a cold delivery tube during gas atomization. Numerical calculations for liquid In, Sn, Bi, Pb, Zn and Sb are performed to investigate the influence of processing parameters and material properties on the flow and cooling of the liquid metals, and to predict the minimum melt superheat that is necessary to prevent the liquid metals from premature solidification during delivery. Processing maps are developed to provide direct insight into the complex relationship between the minimum melt superheat, processing parameters and material properties. A quantitative correlation is derived from the numerical results by means of a regression analysis, which facilitates application of the numerical model. The calculated results reveal that the overpressure, tube length/diameter ratio, ambient temperature and thermal properties of the tube and liquid metals are the important factors influencing liquid metal flow and heat transfer. For the materials studied, the minimum melt superheat ranges from 0.001Tin to 0.17T.~, depending on the processing parameters and material properties. The dependence can be expressed using a correlation derived from the regression analysis such as
منابع مشابه
MODELING OF RAPID SOLIDIFICATION PROCESS IN THE GAS ATOMIZATION OF MOLTEN METALS
In the present work, a model was proposed to predict the thermal history during rapid solidification (RS) of metal droplets in the gas atomization process. The classical theory of heterogeneous nucleation was based on Newtonian heat flow and enthalpy method. Solving the governing numerical equations by the finite difference method (FDM) gave up the opportunity of analyzing the temperature-time ...
متن کاملInvestigation of fluid flow and heat transfer in tube hot metal gas forming process
In this study, hot metal gas forming process of AA6063aluminumtubeis studied with a focus on heat transfer of both fluid and solid phases numerically. An experimental study is simultaneously conducted to validate the numerical method. Some of the most important outputs of the present study, are velocity distribution of fluid inside the tube as well as the fluid in the gap between tube and matri...
متن کاملExperimental and Numerical Analysis of Flow and Heat Transfer in a Gas-Liquid Thermosyphon Heat Exchanger in a Pilot Plant
A numerical and experimental investigation of flow and heat transfer in a gas- liquid Thermosyphon Heat Exchanger "THE" with built in heat pipes and aluminum plate fins for moderate Reynolds numbers has been carried out. It's module is composed of 6 rows and 15 columns copper pipes with aluminum plate fins with dimensions of 130cm height, 47cm width and 20cm depth. The tubes have been fill...
متن کاملHydraulic Network Modeling to Analyze Stream Flow Effectiveness on Heat Transfer Performance of Shell and Tube Heat Exchangers
In this article, stream flow effectivness is based on hydraulic network studied in the shell-side of a shell and tube heat exchange as a case study. For an appropriate heat exchangers rating design to meet a specified duty, it's better to consider each stream flow separately. Using the hydraulic network principals, a set of the correlations for calculating different stream flow rates in the cro...
متن کاملHeat Transfer and Carryover in the Dryout of a Heated Vertical Tube
This work concerns dryout experiments in which a tube, initially containing water, filled up or partially filled and at 1,2 or 3 atmosphere pressures, is heated. The initial water column experience three thermal regions. The first region, called the first period, involves heating of the tube until saturation conditions are obtained in the water. Boiling of the water in the tube causes swelling ...
متن کامل