Time-Resolved Thermal Boundary-Layer Structure in A Pulsatile Reversing Channel Flow  

Oleh:

Lucht, Robert P. ; Kearney, Sean P. ; Jacobi, Anthony M.

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Heat Transfer vol. 123 no. 4 (Aug. 2001), page 655-664.
Topik: boundary layer; pulsating; boundary layer; convection; periodic; enhancement; heat transfer

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ90.2 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

In this paper, the results of an experimental study of the time - resolved structure of a thermal boundary layer in a pulsating channel flow are presented. The developing laminar regime is investigated. Two techniques were used for time - resolved temperature measurements : a nonintrusive, pure - rotational CARS method and cold - wire anemometry. Results are presented for differing degrees of flow reversal, and the data show that the primary impact of reversed flow is an increase in the instantaneous thermal boundary - layer thickness and a period of decreased instantaneous Nusselt number. For the developing laminar parameter space spanned by the experiments, time - averaged heat - transfer enhancements as high as a factor of two relative to steady flow are observed for nonreversing and partially reversed pulsating flows. It is concluded that reversal is not necessarily a requirement for enhancement.

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