The conventional drying model applied to Acacia mangium Willd. timber
Keywords:
Acacia mangium Willd.,, mathematical model, simulation dryingAbstract
A robust mathematical model was built to simulate the heat and mass
transfer process during conventional drying of the Acacia mangium Willd.
timber. This model used codes of the two-dimensions Transpore model
with the same boundary condition data as the experimental drying batch to
evaluate the predictive validity of the model. The properties of Acacia
mangium Willd. wood which were methodically and meticulously
measured in other studies including basic density, porosity, fibre saturation
point (FSP), permeability and diffusion was the second input data for the
model. This made the prediction of the total drying time with high accuracy
(9.7% error when compared with the experimental drying batch).
Simulation results during drying time of the model were shown on 4
graphs. In which, two 3D grid graphs simulated moisture and heat changes
at all positions in the transverse and longitudinal sections, one 2D graph
simulated the surface and averaged moisture, one 2D graph simulated the surface and core temperature of the wood. The comparison between the
simulated and experimental averaged MC curves showed that the root mean
square error (RMSE) for the whole drying process from the initial to the
final MC was relatively large (20.82%). This difference was very large at
above FSP, while these two curve were very fit at below FSP. With the
results obtained, this model was a good tool to help predict and simulate the
drying process in the optimise drying schedules for hardwood.
References
1. Hà Tiến Mạnh, Phạm Văn Chương, Bùi Duy Ngọc, Đỗ Văn Bản, Nguyễn Đức Thành, Bùi Hữu Thưởng, 2021. Một số đặc điểm cấu tạo của gỗ Keo tai tượng (Acacia mangium Willd.) ảnh hưởng đến quá trình sấy. Tạp chí
Khoa học Lâm nghiệp. 2, 100 - 112.
2. Manh, H. T., Redman, A. L., Van, C. P., Ngoc, B. D., 2022. Mass transfer properties of Acacia mangiumplantation wood. Maderas-Cienc Tecnol. 24(2), 1 - 12.
3. Pang, S., 2007. Mathematical Modeling of Kiln Drying of Softwood Timber: Model Development, Validation, and Practical Application. Dry. Technol. 25(3), 421 - 431.
4. Perré, P., Turner, I. W., 1999. Transpore: a generic heat and mass transfer computational model for understanding and visualising the drying of porous media. Dry. Technol. 17(7 - 8), 1273 - 1289.
5. Redman, A. L., Baillères, H., Perré, P., Carr, E. J., Turner, I. W., 2017. A relevant and robust vacuum -drying model applied to hardwoods. Wood Sci.Technol. 51, 701 - 719.
6. Salin, J. G., 1991. Modeling of wood drying: A bibliography. Dry. Technol. 9(3), 775 - 793.
