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Experimental Investigation of Condensation Heat Transfer on Vertical Hydrophilic-Hydrophobic Aluminium Surfaces | ||
| Journal of Heat and Mass Transfer Research | ||
| دوره 9، شماره 1 - شماره پیاپی 17، مرداد 2022، صفحه 39-52 اصل مقاله (1.46 M) | ||
| نوع مقاله: Full Length Research Article | ||
| شناسه دیجیتال (DOI): 10.22075/jhmtr.2022.25698.1369 | ||
| نویسندگان | ||
| Pouyan Mohseni Behbahani* 1؛ GhanbarAli Sheikhzadeh2 | ||
| 1Department of Thermofluids, Faculty of Mechanical Engineering, University of Kashan, Iran | ||
| 2Department of Thermofluids, Faculty of Mechanical Engineering, University of Kashan, Iran. Energy Research Institute, University of Kashan, Iran. | ||
| تاریخ دریافت: 04 دی 1400، تاریخ بازنگری: 18 خرداد 1401، تاریخ پذیرش: 22 خرداد 1401 | ||
| چکیده | ||
| Condensation is an important heat transfer regime, with vast applications in industries such as power generation and cooling systems. In the present study, the changes in the coating thickness and geometry of hydrophobic areas were investigated on hydrophobic-hydrophilic plates and totally hydrophobic ones, and a no-coating plate was also studied experimentally for the condensation phenomenon. Considering the use of aluminium as the base material, tests such as lithography with positive photoresist was conducted to study the photoresist adhesion to the aluminium surface and its impact on heat transfer, as well as testing the lift-off process to remove the remaining photoresist at the final stage of producing the plates, to improve their surfaces and optimize the major parameters in the production stage. For this study, one type of totally hydrophobic surface and two types of hybrid hydrophobic-hydrophilic surfaces with different widths of hydrophobic and hydrophilic areas were produced, each type in three thicknesses of 200, 450 and 900 nm. Considering the different values of coating thicknesses, the width of the hydrophobic and hydrophilic areas, the heat transfer coefficient and heat flux were calculated for each plate, and the optimal conditions for each plate were determined. Compared to the uncoated plates, the heat transfer coefficient and heat flux for each plate with hybrid hydrophobic-hydrophilic surfaces (width of 860 μm for hydrophilic area and 970 μm for the hydrophobic, and thickness of 450 nm) registered increase by 1.44-2.01 and 1.43-1.81 times, respectively, which were the highest among the plates in the present study. | ||
| کلیدواژه‌ها | ||
| Dropwise condensation؛ Filmwise condensation؛ Condensation heat transfer coefficient؛ Heat flux؛ Hybrid hydrophobic-hydrophilic surface | ||
| عنوان مقاله [English] | ||
| بررسی تجربی انتقال حرارت چگالش روی صفحات آلومینیومی آب‌دوست- آب‌گریز عمودی | ||
| چکیده [English] | ||
| ﭼﮕﺎﻟﺶ از رژﯾﻢﻫﺎی ﻣﻬﻢ اﻧﺘﻘﺎل ﺣﺮارت اﺳﺖ ﮐﻪ در ﺑﺴﯿﺎری از ﺻﻨﺎﯾﻊ ﻧﻈﯿﺮ ﺻﻨﺎﯾﻊ ﺗﻮﻟﯿﺪ ﻧﯿﺮو و ﺗﺒﺮﯾﺪ ﮐﺎرﺑﺮد ﮔﺴﺘﺮده‌ای دارد. در این پژوهش تغییرات ضخامت پوشش و هندسه مناطق آب‌گریز روی صفحات هیبریدی آب‌دوست-آب‌گریز عمودی و سطوح کاملا آب‌گریز بررسی شد و با صفحه بدون پوشش در پدیده چگالش مورد مطالعه تجربی صورت گرفت. با توجه به استفاده از آلومینیوم به عنوان ماده پایه، تست هایی از قبیل لیتوگرافی با فتورزیست مثبت برای اطلاع از چسبندگی فتورزیست به سطح آلومینیوم و تاثیر آن بر انتقال حرارت و همچنین تست فرآیند لیفت-آف برای حذف فتورزیست باقیمانده در مرحله نهایی ساخت صفحات، برای اصلاح سطح آن انجام گردید تا پارامترهای مهم در فاز ساخت بهینه سازی شوند. در این پژوهش، یک نوع سطح کاملا آب‌گریز و دو نوع سطح هیبریدی آب‌دوست-آب‌گریز با عرض ناحیه آب‌دوست و آب‌گریز متفاوت تولید شده که هر نوع از آنها در سه ضخامت مختلف 200 نانومتر، 450 نانومتر و 900 نانومتر تولید شده است. با توجه به مقادیر مختلف ضخامت پوشش‌ها، عرض نواحی آب گریز و آب‌دوست، ضریب انتقال حرارت و شار گرمایی در هر صفحه محاسبه گردید و مشخصات صفحه بهینه نیز بدست آمد. مقدار ضریب انتقال حرارت و شار گرمایی در صفحه با سطح هیبریدی آب‌دوست-آب‌گریز با عرض ناحیه آب‌دوست 860 میکرومتر و عرض ناحیه آب‌گریز 970 میکرومتر با ضخامت 450 نانومتر نسبت به صفحه بدون پوشش، بترتیب به میزان 2/01 – 1/44 برابر و 1/81 – 1/43 برابر افزایش داشته که بالاترین مقدار در میان بقیه صفحات بوده است. | ||
| کلیدواژه‌ها [English] | ||
| چگالش قطره‌ای, چگالش فیلمی, ضریب انتقال حرارت چگالش, شار حرارتی, صفحات هیبریدی آب‌دوست- آب‌گریز | ||
| مراجع | ||
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