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k (SI unit: W/(m K)) is the thermal conductivity of the fluid,
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kp (SI unit: W/(m K)) is the particle thermal conductivity,
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T (SI unit: K) is the fluid temperature,
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dp (SI unit: m) is the particle diameter,
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μ (SI unit: Pa s) is the fluid dynamic viscosity,
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ρ (SI unit: kg/m3) is the fluid density, and
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Mg (SI unit: kg/mol) is the gas molar mass,
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rp (SI unit: m) is the particle radius.
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