Abstract




 
   

IJE TRANSACTIONS A: Basics Vol. 31, No. 1 (January 2018) 136-143   

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  AN EXPERIMENTAL STUDY OF NANOFLUIDS OPERATED SHELL AND TUBE HEAT EXCHANGER WITH AIR BUBBLE INJECTION
 
G. Thakur, G. Singh, M. Thakur and S. Kajla
 
( Received: April 18, 2017 – Accepted in Revised Form: November 30, 2017 )
 
 

Abstract    Shell and Tube heat exchangers are the heat exchangers that are most widely used in industries and for other commercial purposes. There are many techniques that have been utilized to enhance the heat transfer performance of the shell and tube heat exchangers. Air bubble injection is one of the promising and inexpensive techniques that can create turbulence in the fluids resulting in to enhancement of heat transfer characteristics of the shell and tube heat exchangers. In this paper, experimental study of heat transfer characteristics have been done by injecting air bubbles at tube inlet and throughout the tube for 0.1%v/v and 0.2%v/v Al2O3 nanoparticle concentration. Results obtained at two different injection points for both concentrations are compared with the case when no air bubble injection is done. The results showed the enhancement in the heat transfer characteristics with air bubble injection and volumetric concentration of nanoparticles. The maximum enhancement was found to be in the case where air bubbles are injected throughout the tube which is followed by the air bubble injection at the tube inlet and without air bubble injection. As the bubbles were injected throughout the tube, approximately 22-33% enhancement was observed. The overall heat transfer coefficient with injecting air bubbles throughout the tube showed an enhancement of about 12-23% and 14-25% for 0.1% and 0.2% of nanofluids.

 

Keywords    Shell and Tube heat exchanger, Nanofluids, Heat transfer coefficient, Nusselt number

 

چکیده    مبادله­کن­های حرارتی پوسته و لوله­ای مبادله­کن­هایی هستند که به طور گسترده در صنایع و دیگر کاربردهای تجاری استفاده می­شوند. فنون بسیاری برای افزایش عملکرد انتقال حرارت مبادله­کن­های حرارتی پوسته و لوله­ای وجود دارد. تزریق حباب هوا یکی از فنون امیدوار کننده و ارزان قیمت است که می تواند باعث ایجاد آشفتگی در مایعات شود، که در نتیجه افزایش ویژگی­های انتقال حرارت مبادله­کن­های حرارتی پوسته و لوله­ای را به دنبال دارد. در این مقاله، بررسی تجربی ویژگی­های انتقال حرارت در اثر تزریق حباب­های هوا در ورودی لوله و از طریق لوله برای 0.1 و 0.2درصدحجمیAl2O3 غلظت نانوذرات انجام شده است. نتایج حاصل از دو نقطه تزریق مختلف برای هر دو غلظت در مقایسه با حالت بدون تزریق حباب هوا مقایسه ­شد. نتایج نشان داد که افزایش ویژگی­های انتقال حرارت با تزریق حباب هوا و غلظت حجمی نانوذرات صورت می­گیرد. حداکثر افزایش به ترتیب برای حالت تزریق حباب­های هوا در داخل لوله ، پس از آن تزریق حباب هوا در ورودی لوله و در آخرین حالت بدون تزریق حباب هواست. همان طور که حباب­های هوادر سراسر لوله تزریق شد، ضریب انتقال حرارت تقریبا 22 تا33درصدافزایش یافت. ضریب انتقال حرارت کلی با حباب­های تزریقی در طول لوله نشان می­دهد که افزایش حدود 12-23٪ و 14-25٪ برای 0.1٪ و 0.2٪ نانو سیالات است.

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