Enthalpy Method To Compute Radial Heating And Thawing Of Logs

Authors

  • H. Peter Steinhagen
  • Harry W. Lee

Keywords:

Heat transfer model, thawing model, phase change model, enthalpy method, finite-difference technique, simulation, logheating

Abstract

This paper discusses an enthalpy method to compute transient temperatures of logs. The logs may be initially frozen. It is assumed that the logs are subjected to radial heating in agitated water. The method handles phase change at a distinct temperature, which is an advantage over a previous (temperature) method. Calculations for four test logs were performed by a computerized, explicit finite-difference scheme called LOGHEAT. Model and experiment closely agreed with each other. Simplified "by hand" calculations were also satisfactory.

References

Beckman, W. A. 1972. HEAT (Heat transfer computer program in FORTRAN V language). EES Report No. 37, Engineering Experiment Station, University of Wisconsin, Madison, WI.nBonacina, C., G. Comini, A. Fasano, and M. Primicerio. 1973. Numerical solution of phase-change problems. Int. J. Heat Mass Transfer 16:1825-1832.nSteinhagen, H. P. 1977a. Heating times for frozen veneer logs—New experimental data. Forest Prod. J. 27(6):24-28.nSteinhagen, H. P. 1977b. Thermal conductive properties of wood, green or dry, from -40° to +100°C: A literature review. USDA Forest Service General Technical Report FPL-9, Forest Products Laboratory, Madison, WI.nSteinhagen, H. P. 1986. Computerized finite-difference method to calculate transient heat conduction with thawing. Wood Fiber Sci. 18(3):460-467.nSteinhagen, H. P. and H. W. Lee. 1986. LOGHEAT (Copyrighted IBM-PC computer program on a floppy disk). Idaho Research Foundation, University of Idaho, Moscow, ID.nSteinhagen, H. P., H. W. Lee, and S. P. Loehnertz. 1987. LOGHEAT: A computer program for determining log heating times for frozen and nonfrozen logs. Forest Prod. J. 37(11/12):60-64.nVoller, V., and M. Cross. 1981a. Accurate solutions of moving boundary problems using the enthalpy method. Int. J. Heat Mass Transfer 24:545-556.nVoller, V., and M. Cross. 1981b. Estimating the solidification/melting times of cylindrically symmetric regions. Int. J. Heat Mass Transfer 24:1457-1462.n

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Published

2007-06-22

Issue

Number 4 / October 1988

Section

Research Contributions

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