研究目的
Investigating the thermal performance and deriving a general Nusselt number correlation for the porous volumetric solar receiver with different geometrical parameters.
研究成果
The study successfully establishes pore-scale numerical models of the porous volumetric solar receiver with different geometrical parameters and derives a general Nusselt number correlation. Larger inlet velocity enhances convective heat transfer but decreases overall temperature. Receivers with larger porosity limit reflection losses and have higher Nusselt numbers. The derived correlation is applicable for porosity 0.74–0.89 and Reynolds number 3–233.
研究不足
The study is limited to porosity ranging from 0.74 to 0.89 and pore Reynolds number ranging from 3 to 233. The thermal boundary conditions and geometrical parameters of the porous media may not cover all practical scenarios.
1：Experimental Design and Method Selection:
Pore-scale numerical models of the porous volumetric solar receiver are established using X-ray computed tomography and imaging processing techniques. The conjugate heat transfer process is solved based on direct pore-scale numerical simulation with the Shear-Stress Transport k-ω model for turbulent flow and Beer’s law for absorbed solar energy simulation.
2：Sample Selection and Data Sources:
Porous media with different geometrical parameters are reconstructed from a porous sample scanned by YXLON Cheetah X-ray inspection system.
3：List of Experimental Equipment and Materials:
YXLON Cheetah X-ray inspection system, software Mimics and 3-matic for 3D model generation, software VGStudio MAX 3.0 for strut thickness measurement, ANSYS FLUENT for numerical simulations.
4：0 for strut thickness measurement, ANSYS FLUENT for numerical simulations.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The porous models are imported into ICEM for mesh generation. Simulations are performed with uniform inlet velocity, temperature, and solar radiation distribution. The DO model simulates radiation transfer, and UDF in ANSYS FLUENT calculates the energy source due to solar radiation.
5：Data Analysis Methods:
The average Nusselt numbers of the receivers as a function of Reynolds number for different porous volumetric solar receivers are plotted and analyzed.
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