Abstract




 
   

IJE TRANSACTIONS C: Aspects Vol. 28, No. 3 (March 2015) 476-482   

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  INVESTIGATION OF THERMO-HYDRAULIC PERFORMANCE OF CIRCULAR TUBE FITTED WITH CENTER-CLEARED TWISTED TAPE USING CFD MODELING (RESEARCH NOTE)
 
Y. Vazifeshenas and M. A. Delavar
 
( Received: April 02, 2014 – Accepted: November 13, 2014 )
 
 

Abstract    The article presents a practical technique for enhancing thermo-hydraulic performance of a circular tube. In this way, numerical method focusing on laminar tubular flow is used to compare the effectiveness of utilizing center-cleared twisted tapes instead of typical shape of short width tapes. Numerical analysis represented that using both center-cleared and typical shape of twisted tapes, Re enhancement reduces the flow resistance. Studying short width twisted tapes showed that decreasing the width of twisted tape, reduces the heat transfer and hydraulic performance. Contrarily, using sufficient clearance for center-cleared twisted tapes can increase the heat transfer. Hence, applying center-cleared twisted tape as a tool of enhancing heat transfer can be a promising and practical idea.

 

Keywords    Twisted Tape, Heat Transfer, Friction Factor, Laminar Tubular Flow

 

چکیده    این مقاله روشی عملی برای افزایش عملکرد حرارتی-سیالاتی لوله با مقطع دایروی ارائه می دهد. این روش، از رویکردی عددی با تمرکز بر جریان آرام درون لوله استفاده می کند تا بتواند به مقایسه تاثیر استفاده از نوارهای پیچیده شده از وسط خالی شده در اندازه های خاص در مقابل نوارهای ساده و مرسوم با عرض کوتاهتر بپردازد. تحلیل عددی نشان داده است که در هر دو حالت استفاده از نوارهای از وسط خالی شده و نوارهای ساده ی مرسوم با افزایش عدد رینولدز مقاومت مسیر سیال کاهش می یابد. مطالعه ی نوارهای با عرض کوتاه نشان داده است که با کاهش عرض نوار عملکردحرارتی و هیدرولیکی لوله مبدل کاهش می یابد. برخلاف آن با استفاده از نوارهای از وسط خالی شده با اندازه ی خاص در فضای خالی، می توان انتقال حرارت را افزایش داد. بنابراین استفاده از نوار پیچیده شده از وسط خالی شده در یک اندازه خاص می تواند بعنوان ایده ای عملی و مفید برای افزایش انتقال حرارت بشمار آید.

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