کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4995035 | 1458489 | 2017 | 56 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Experimental study on bubble departure characteristics in subcooled nucleate pool boiling
ترجمه فارسی عنوان
بررسی تجربی در خصوص ویژگی های خروجی حباب در جوشش استخر است
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کلمات کلیدی
جوشاندن استخر، حباب ها، انتقال گرما، زیرخاک
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
The boiling models use departure diameter and frequency in closure relations for the calculation of nucleate boiling heat flux. These parameters are normally derived from empirical correlations which depend heavily on experiments. While these parameters are studied mostly for saturated conditions, there is not sufficient data for the values of departure diameter and frequency in subcooled boiling. In this work, the bubble departure characteristics, i.e. the departure diameters and frequency have been measured using high speed visualization experiments with subcooled demineralized water at atmospheric pressure for nucleate pool boiling conditions. The water pool dimensions wereâ300ââmmâà 135ââmmâà 250ââmm with four different heating elements to carry out the parametric studies of bubble departure behavior. The considered parameters were heater surface roughness, heater geometry and heater inclination along with the experimental conditions like degree of subcooling (ÎTsub = 5â20 K), superheat (ÎTsat = 1â10 K) and the heat flux. The departure diameters and frequencies were directly measured from the images captured. It was intended to generate the subcooled nucleate pool boiling data under a wide range of conditions which are not present in the literature. The departure diameter was found to increase with the wall superheat, heater size and the inclination angle while the liquid subcooling and surface roughness produced a damping effect on the diameter. The departure frequency was found to increase with the wall superheat and the inclination angle, but decreases with an increase in the heater size. The frequency increases with the degree of subcooling except very close to the saturation, and is unaffected by the surface roughness beyond a certain superheat value.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Multiphase Flow - Volume 89, March 2017, Pages 163-176
Journal: International Journal of Multiphase Flow - Volume 89, March 2017, Pages 163-176
نویسندگان
Parul Goel, Arun K. Nayak, Parimal P. Kulkarni, Jyeshtharaj B. Joshi,