Near-infrared measurement of temperature fields formed by mixed convection from a small heating sphere in water
نویسندگان
چکیده
This study proposed a method for reconstructing three-dimensional (3D) non-axisymmetric temperature fields in water formed by mixed convection surrounding small heating sphere. The is based on the dependence of absorption coefficient at wavelength 1150 nm near-infrared (NIR) region. absorbance images 10-mm-thick cell containing 1-mm diameter steel sphere heated via electromagnetic induction were acquired using two-orthogonal-direction NIR imaging system. 3D reconstruction was implemented applying inverse Abel transform to images. In addition, particle tracking velocimetry (PTV) applied same visualize and quantify flow field. results indicated that distribution within plume distorted compared an axisymmetric one, shape, length, angle dependent forced power. Further, employing thermal balance model with distributions, heat production rates determined discussed characteristics. PTV revealed field inconsistent which also verified comparison numerical simulations. • Simultaneous measurement method. Reconstruction laminar plumes. Determination rate Particle
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ژورنال
عنوان ژورنال: International Journal of Thermal Sciences
سال: 2022
ISSN: ['1778-4166', '1290-0729']
DOI: https://doi.org/10.1016/j.ijthermalsci.2022.107498