کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5351078 1503570 2017 31 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nanosecond laser texturing of uniformly and non-uniformly wettable micro structured metal surfaces for enhanced boiling heat transfer
ترجمه فارسی عنوان
بافت لیزری نانوساختار سطوح فلزی میکرو سازگار یکنواخت و غیر قابل جذب برای افزایش گرما جوش
کلمات کلیدی
لیزر نانوساختار، بافتن سطح، رطوبت غیر یکنواخت، میکروکنولوژی، معیارهای هسته ای، انتقال گرما جوش پیشرفته،
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
چکیده انگلیسی
Microstructured uniformly and non-uniformly wettable surfaces were created on 25-μm-thin stainless steel foils by laser texturing using a marking nanosecond Nd:YAG laser (λ = 1064 nm) and utilizing various laser fluences and scan line separations. High-speed photography and high-speed IR thermography were used to investigate nucleate boiling heat transfer on the microstructured surfaces. The most pronounced results were obtained on a surface with non-uniform microstructure and non-uniform wettability. The obtained results show up to a 110% higher heat transfer coefficients and 20-40 times higher nucleation site densities compared to the untextured surface. We show that the number of active nucleation sites is significantly increased in the vicinity of microcavities that appeared in areas with the smallest (10 μm) scan line separation. Furthermore, this confirms the predictions of nucleation criteria and proves that straightforward, cost-effective nanosecond laser texturing allows the production of cavities with diameters of up to a few micrometers and surfaces with non-uniform wettability. Additionally, this opens up important possibilities for a more deterministic control over the complex boiling process.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 399, 31 March 2017, Pages 480-490
نویسندگان
, , , ,