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Classical Heat Transfer – Quantum Effects

When does the Classical Heat transfer fail / stop to work , i.e, when will the quantum effects have any effect on the heat transfer.
My problem is a heat transfer between a Spherical Bacterial Spores(an agglomerate) and a hot gas (take Nitrogen) . I really dont know whether the spores can be considered as Solid with a lattice structure
Also i want to know what is the role of Energy Accommodation Coefficient ?
Because in classical heat transfer and our calculations we consider it as 1 ,
but recently came across in a paper that it maybe close to zero , does this affect the heat transfer ?

Asked Gowtham


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