کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4991761 1457117 2017 16 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Research PaperPeriodically fully-developed heat and fluid flow behaviors in a turbulent tube flow with square-cut twisted tape inserts
ترجمه فارسی عنوان
مقاله پژوهشی دوره های جریان حرارتی و جریان مایع به طور کامل توسعه یافته در یک جریان لوله ای آشفته با درج نوار پیچیده شده مربع
کلمات کلیدی
نوار پیچیده برش مربع، نوار کلاسیک پیچ خورده، مبدل حرارتی، انتقال گرما، جریان چرخش، جریان آشفته
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی


- SCTs offer superior thermal performance to a classical twisted tape.
- Heat transfer rate increases with decreasing perforated width ratio.
- As perforated width ratio increases, thermal performance increases.
- SCTs give thermal performance of up to 1.37.

This article reports a numerical study of enhancing heat transfer and thermal performance of in a circular tube inserted by square cut twisted-tapes in comparison with that inserted by classical twisted tapes. The study was carried out for a turbulent periodic flow in a three-dimensional constant heat flux-wall tube. The influences of square cut twisted-tape geometries including perforated width to tape width ratios (WR = w/W = 0.5, 0.6, 0.7, 0.8 and 0.9) and perforated length to tape width ratios (LR = L/W = 0.7, 0.8 and 0.9) were determined. The main findings are that the heat transfer and pressure loss increase with decreasing perforated width to tape width ratio (WR) and perforated length to tape width ratio (LR) while thermal enhancement factor (TEF) increases as WR increases. The highest thermal enhancement factor (TEF) of 1.37 is achieved by using square-cut twisted tapes at the largest perforated width to tape width ratio (WR = 0.9) and the smallest perforated length to tape width ratio (LR = 0.7) at Reynolds number (Re) of 7000. The highest thermal enhancement factor (TEF) is around 1.32 times over than that given by the classical twisted tape.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Thermal Engineering - Volume 112, 5 February 2017, Pages 895-910
نویسندگان
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