کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
651201 1457402 2016 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Confined characteristics of bubble during boiling in microchannel
ترجمه فارسی عنوان
خصوصیات حباب در هنگام جوش در میکرو کانال
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی


• Bubble confined characteristics during boiling in microchannel were studied experimentally.
• Confined bubble is characterized by the fluctuated variations of bubble shape parameters.
• Increased and dynamic bubble growth force leads to confined characteristics of growing bubble.
• Bubble growth force in microscale is jointly determined by bubble growth rate and space size.
• Heat flux and microchannel size greatly affect the characteristics of bubble confined growth.

Bubble confined growth during boiling in micro-scale space is experimentally investigated. Degassed deionized water (DI water) is used to study the confined characteristics of growing bubble in microchannel. Mechanisms of bubble confinement in microscale space are discussed. Effects of heat flux and microchannel size on bubble confined growth are examined. The cross-sections of the tested rectangular microchannel are 0.5 mm × 1 mm and 1 mm × 1 mm respectively. The bubble growth process is observed and recorded by high speed CCD camera with 250 frames per second. The confined characteristics of bubble in microchannel are represented by the fluctuated variation of bubble root contact angle and other two bubble shape parameters, namely the maximal local void fraction of bubble and the bubble aspect ratio. The increased bubble growth force caused by miniaturization of space size is the chief mechanism for bubble confined characteristics in microchannel. Moreover, it is found that whether a growing bubble in microchannel will show confined characteristics is irrelevant to whether or not it will finally occupy the whole microchannel cross-section. The bubble confined characteristics are jointly controlled by the bubble growth rate and the size of microscale space. In some cases the bubble confined growth features are not displayed throughout the growth period even the bubble completely occupies the whole microchannel cross-section.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Experimental Thermal and Fluid Science - Volume 74, June 2016, Pages 247–256
نویسندگان
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