An examination of hot-wire length corrections

AIP Publishing - Tập 26 Số 7 - Trang 1751-1754 - 1983
R. W. Derksen1, R. S. Azad1
1Department of Mechanical Engineering, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2

Tóm tắt

A comprehensive experimental examination is presented of the effect of hot-wire length for a single-wire probe. Specially constructed hot wires, with 2.5 μm and 5.0 μm nominal diameters and lengths from 0.3 mm to 2.8 mm, were used to measure the one-dimensional spectrum of the streamwise fluctuating velocity component u as well as the skewness and flatness of both u and du/dt. All measurements were made in air at Y+=150 (corresponding to Y/δ=0.1) in a boundary layer growing inside a pipe. The Reynolds number was 37 000 based on the velocity at the centerline and on the boundary-layer thickness. The longest wires exhibited some attenuation at the highest wavenumbers. This attenuation was found to roughly confirm the correction to the spectrum due to Wyngaard. A correction for the microscale λ, and thus dissipation, was examined and found to be correct to a fair degree (within 8%). This correction is based on the early work of Skramstad and of Frankiel, but with the integral scale of R11 (0, 0, r) assumed to equal the λ scale. The measurements of skewness and flatness did not indicate an experimentally discernible effect of the length of the hot wire.

Từ khóa


Tài liệu tham khảo

1949, Phys. Rev., 75, 1263

1954, Aeronaut. Q., 5, 1, 10.1017/S0001925900001049

1957, J. Fluid Mech., 2, 313, 10.1017/S0022112057000166

1981, J. Fluid Mech., 107, 297, 10.1017/S0022112081001791

1968, J. Sci. Instrum. (J. Phys. E.), 1, 1105, 10.1088/0022-3735/1/11/310

1953, Q. Appl. Math., 10, 375, 10.1090/qam/51466

1965, Phys. Fluids, 8, 1063, 10.1063/1.1761356

1978, J. Fluid Mech., 86, 67, 10.1017/S0022112078001019

1969, J. Sci. Instrum. (J. Phys. E.), 2, 983, 10.1088/0022-3735/2/11/320

1975, Boundary-Layer Meteorol., 8, 173, 10.1007/BF00241336

1967, Rev. Sci. Instrum., 38, 677, 10.1063/1.1720798

1967, J. Appl. Meteorol., 6, 952, 10.1175/1520-0450(1967)006<0952:ASCSD>2.0.CO;2

1971, J. Fluid Mech., 48, 477, 10.1017/S002211207100171X

Thông tin
Thông tin xuất bản

AIP Publishing

Tập 26 Số 7

1751-1754

Thông tin tác giả