دانلود رایگان مقاله لاتین انتقال حرارت در کانال هوای خورشیدی از سایت الزویر
عنوان فارسی مقاله:
افزایش انتقال حرارت در کانال هوای خورشیدی با بافل متعدد شکسته نوع V
عنوان انگلیسی مقاله:
Heat transfer enhancement in solar air channel with broken multiple V-type baffle
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Solar energy in the form of solar radiation is freely available and non-polluting source of energy. The solar energy is converted into thermal energy by using solar collector for various engineering applications. The various heat transfer techniques has been developed to improve the thermal performance of solar collectors and these techniques has been applied in several industrial applications. According to literature, the thermal performance of SAC can be improved by the use baffles. Baffles in the SAC are used to produce turbulence, so as to augment the Nurs. In order to create turbulence, baffles are placed into the forced flow to generate a secondary stream. Among the techniques used to improve Nurs in a without baffle SAC one is to place broken multiple V-type baffles on the channel walls [1–8]. For entire information of several experimental and mathematical techniques on baffles with distinct shapes, size, and orientations, readers may refer to. Dutta and Hossain [9] investigated the Nurs and f rs in a SAC with inclined solid and perforated baffles. During experimentation they found that local Nurs distribution significantly depends on the perforation, orientation, and position of the second baffle plate and Nurs was 5.0 times high as compared to flat channel. Karwa et al. [10] experimentally studied the effect of solid and perforated baffles with Re varies from 2850 to 11,500, W H/ D D of 7.77, P H/B B of 29, H H/B D is 0.495. Lin [11] experimentally investigated the Nurs and f rs in SAC with baffles. Author examined the experimental outcomes of Nurs for baffle designed with various heights and pores. Romdhane [12] examined that effect of Nurs in a baffled solar air collector. The baffles were attached in the SAC. Baffles extend the trajectory of the circulation and keep the air in contact with the absorber and act as wings and improve Nurs of the air. Shin and Kawak [13] studied the effect of the perforation shape for a blockage wall on the Nurs in a stream passage. Five wide, narrow and circular hole geometries were tested. Karwa and Maheshwari [14] experimentally study Nurs and f rs in a SAC with transverse fully perforated baffles and half perforatedbaffles attached to one of the broad wall. Ozgen et al. [15] reported the thermal performance in a SAC with baffles fitted to the heated wall. Bopche and Tandale [16] reported the wholly developed stream in a roughened SAC with U-shaped pattern baffles. Eiamsa-ard et al. [17] investigated the heat transfer augmentation in a SAC with winglet delta twisted tape baffles with different βO and H H/B D. Their studies shows that Nurs and f rs data with winglet delta twisted tape were superior as compared to without winglet delta twisted tape. Promvong et al. [18] mathematically examined the performance of Nurs and f rs in square channel attached with 45° inclined baffles with aRe ranging from 100 to 1200. Promovong [19] experimentally investigated the turbulent forced convection Nurs and f rs loss behavior in a high W H/ D D channel attached with 60° V-shaped baffles. Akpinar et al. [20] experimentally investigate the performance analysis of four types of SAH with different obstacles and without obstacle. They reported that efficiency of SAH depends on the surface geometry of collectors, solar radiation of air stream line. Chompookham et al. [21] experimentally studied the effect of winglet vortex type generators on the Nurs and f rs behaviors for a turbulent stream. Bekele and Mishra [22] carried out the experimental studied of the turbulent air stream and heat transfer characteristics of SAC with delta shaped obstacle attached to the upper wall of a channel. Zhou and Ye [23] carried out the experimental studied of the turbulent air stream and heat transfer characteristics of SAC with delta winglet vortex generator baffles attached to the upper surface of a channel. Chamoli and Thakur [24] conducted an indoor experimental investigation to study Nurs and f rs data of air passing through an air channel that was roughened by V-shaped perforated baffles. Tamna et al. [25] investigated the effect of multiple V baffle vortex generators to improve Nurs in a channel fitted with 45° BVG with Re ranging from 4000 to 21,000, H H/B D¼0.25, P H/B B ¼0.5, 1 and 2 and αa equal to 45° respectively. Alam et al. [26] experimentally investigated the effect of H H/B D of 0.4–1.0, P H/B B of 4–12, βO of 5–25%, αa of 60° and Re varies from 2000 to 20,000 on V-shaped perforated blocks SAH with W H/ D D of 10. Table 1 summarises the experimental investigations of some important baffle arrangements reported by various researchers.
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کلمات کلیدی:
Heat transfer enhancement in solar air channel with broken multiple V ... www.sciencedirect.com/science/article/pii/S2214157X16300533 by R Kumar - 2016 - Cited by 4 - Related articles Also, the results reveal that the broken multiple V-type baffles are thermo-hydraulically superior as compared to the other baffles shaped solar air channel. Heat transfer enhancement in solar air channel with broken multiple V ... https://www.researchgate.net/.../305077573_Heat_transfer_enhancement_in_solar_air_c... Official Full-Text Publication: Heat transfer enhancement in solar air channel with broken multiple V-type baffle on ResearchGate, the professional network for ... 한글번역 보기 www.ndsl.kr/ndsl/search/detail/.../articleSearchResultDetail.do?cn... - Translate this page Case studies in thermal engineering 2016 v.8, 2016년, pp.187 - 197. Heat transfer enhancement in solar air channel with broken multiple V-type baffle. Kumar ... [PDF]Heat transfer enhancement in solar air channel with broken multiple V ... iranarze.ir/wp-content/uploads/2016/11/E2829.pdf Jul 7, 2016 - optimum relative width parameter of the solar air channel of aspect ratio of ... baffle SAC one is to place broken multiple V-type baffles on the ...
