The Time Delay for A Perceptible Thermal Disturbance in A Slab  

Oleh:

Davies, M. G.

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Heat Transfer vol. 121 no. 4 (Nov. 1999), page 1072-1075.
Topik: thermal conductivity; time delay; perceptible thermal; disturbance; slab

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ90.1 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

If a thermal disturbance such as a step change in temperature is applied at each surface of a homogeneous slab of thickness 2L, the effect of cooling at x = +L at first has no effect at x = -L but is clearly evident after a time described by a Fourier number F0 = at / p(c)((p))L(2) of around 0.2. To establish the time of a perceptible change the minimum value of o(i) - (o (1) + (o(2)) is sought, where o(1) is the flux into a semi - infinite solid and o(1) and o(2) are the first and second eigenfunction contributions to the solution for a slab of finite thickness. Cooling throughout the slab is determined virtually by the first eigenfunction alone after F(0 = 0.22. For a fluid-cooled slab these values are larger.

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