STUDY ON HEAT TRANSFER AUGMENTATION IN AN AIR HEATER USING RECTANGULAR WAVY FIN TURBULATORS

IF 1.1 Q4 THERMODYNAMICS

Frontiers in Heat and Mass Transfer Pub Date : 2022-09-19 DOI:10.5098/hmt.19.10

Shiva Kumar, Nitesh Kumar

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Abstract

In the present study, the use of wavy fin turbulators on the annulus body of a double pipe air heater has been numerically investigated. The inner pipe consists of hot water whereas the annular section consists of cold air whose Reynolds Number (Re) ranged from 3000-15,000. Rectangular cross-sectioned wavy fin turbulators with various curvature ratios of 2, 3, 5, and 7.5 is numerically simulated to investigate the influence of curvature effects on turbulence. Results have been compared with the bare pipe and with rectangular straight fins. It is seen that wavy fin turbulators perform better (compared to (other two) bare and rectangular straight fin) than both of them by creating turbulence effects in the flow field. Nusselt number (Nu) is increased by 256% and 51% as compared to bare and rectangular straight fin type. Parametric studies revealed that as the curvature ratio (CR) is reduced, the turbulent intensity and turbulent kinetic energy increase with better heat transfer characteristics. The highest Thermo hydraulic performance index of 4.8 is noticed for the CR of 2 at a Re of 6000 and is 34% higher than the straight rectangular fin.

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矩形波翅型紊流器在空气加热器中的强化传热研究

本文对双管空气加热器环空体上波纹翅片紊流的应用进行了数值研究。内管由热水组成，而环空部分由冷空气组成，其雷诺数(Re)范围为3000-15,000。对曲率比为2、3、5和7.5的矩形截面波浪鳍型紊流进行了数值模拟，研究了曲率效应对紊流的影响。结果与裸管和矩形直翅片进行了比较。可以看出，波浪鳍型紊流器(与(其他两种)裸鳍和矩形直鳍相比)通过在流场中产生湍流效应而优于两者。与裸鳍型和矩形直鳍型相比，努塞尔数(Nu)分别提高了256%和51%。参数化研究表明，随着曲率比(CR)的减小，湍流强度和湍流动能增大，换热特性更好。在Re为6000时，CR为2时，热水力性能指数最高，为4.8，比直矩形翅片高34%。

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来源期刊

Frontiers in Heat and Mass Transfer THERMODYNAMICS-

CiteScore

2.50

自引率

61.10%

发文量

审稿时长

10 weeks

期刊介绍： Frontiers in Heat and Mass Transfer is a free-access and peer-reviewed online journal that provides a central vehicle for the exchange of basic ideas in heat and mass transfer between researchers and engineers around the globe. It disseminates information of permanent interest in the area of heat and mass transfer. Theory and fundamental research in heat and mass transfer, numerical simulations and algorithms, experimental techniques and measurements as applied to all kinds of current and emerging problems are welcome. Contributions to the journal consist of original research on heat and mass transfer in equipment, thermal systems, thermodynamic processes, nanotechnology, biotechnology, information technology, energy and power applications, as well as security and related topics.