TY - JOUR

T1 - Direct measurements of steady heat transfer maintained by oscillating pipe flow in thermoacoustic system

AU - Biwa, T.

AU - Kobayashi, T.

AU - Hyodo, H.

N1 - Funding Information:
T.B. thanks Professor Guillaume Penelet of Laboratoire d’Acoustique de l’Université du Mans for a fruitful discussion during the visit supported by the Acoustics Hub program of Le Mans Université. This work was supported by the Sumitomo Foundation for Basic Science Research Projects.
Publisher Copyright:
© 2018 Author(s).

PY - 2019/1/7

Y1 - 2019/1/7

N2 - This study reports direct measurements of steady heat transfer in a heat exchanger pipe of a thermoacoustic heat pump driven by an oscillating helium gas flow. From simultaneous measurements of gas temperature, pressure, and velocity fluctuations, the steady heat transfer rate is determined from the radial profile of the temporal mean temperature and from the axial distribution of the enthalpy flux density. The heat transfer coefficient h is determined to be given by h = 2 k / r 0 consistently in the range of 1.6 ≤ r 0 / δ α ≤ 6.6, where k is the gas thermal conductivity, r 0 is the tube radius, and δ α = 2 α / ω is the characteristic transverse length given by using the thermal diffusivity and angular frequency.

AB - This study reports direct measurements of steady heat transfer in a heat exchanger pipe of a thermoacoustic heat pump driven by an oscillating helium gas flow. From simultaneous measurements of gas temperature, pressure, and velocity fluctuations, the steady heat transfer rate is determined from the radial profile of the temporal mean temperature and from the axial distribution of the enthalpy flux density. The heat transfer coefficient h is determined to be given by h = 2 k / r 0 consistently in the range of 1.6 ≤ r 0 / δ α ≤ 6.6, where k is the gas thermal conductivity, r 0 is the tube radius, and δ α = 2 α / ω is the characteristic transverse length given by using the thermal diffusivity and angular frequency.

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U2 - 10.1063/1.5064420

DO - 10.1063/1.5064420

M3 - Article

AN - SCOPUS:85059583222

VL - 125

JO - Journal of Applied Physics

JF - Journal of Applied Physics

SN - 0021-8979

IS - 1

M1 - 014903

ER -