کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6690257 | 501894 | 2014 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Study on oscillating flow of moderate kinetic Reynolds numbers using complex velocity model and phase Doppler anemometer
ترجمه فارسی عنوان
مطالعه جریان های نوسان رینولدز سینتیک متوسط با استفاده از مدل سرعت پیچیده و آنومومتر فاز داپلر
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
مهندسی انرژی و فناوری های برق
چکیده انگلیسی
Oscillating flows have fundamental effects on the heat and mass transfer of Stirling engines and gas springs. A complex velocity model was proposed to describe the fully-developed laminar oscillating flow through introducing complex functions and simplified control equations. The maximum dimensionless velocity decreased and the smooth core area of velocity expanded as the kinetic Reynolds number increased, which led the Stokes layer became thinner. Experiments were carried out in an apparatus consisting of piston-cylinder space connected to a straight duct. Instantaneous velocities of oscillating flows for ReÏ value of 230, 900 and 1800 were measured by a phase Doppler anemometer (PDA), where the effects of responding time, accuracy and features of tracer particles were analyzed. The experiments indicated that the complex velocity model with ReÏ was suitable to describe the fully-developed laminar oscillating flow, and the average deviation was about 10%. For a moderate-value ReÏ, the ratios of maximum dimensionless velocity for r = 0.85 R to r = 0 R were 1.06-1.10, which were evidences of “annular effect”.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Energy - Volume 130, 1 October 2014, Pages 830-837
Journal: Applied Energy - Volume 130, 1 October 2014, Pages 830-837
نویسندگان
Gang Xiao, Tianxue Zhou, Mingjiang Ni, Conghui Chen, Zhongyang Luo, Kefa Cen,