Computational analysis of heat transfer in turbulent flow past a horizontal surface with two-dimensional ribs

Lee, C.K.; Abdel-Moneim, S. A.

doi:10.1016/s0735-1933(01)00223-8

Cited by 51 publications

(16 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The presence of rib may enhance heat transfer because of interruption of the viscous sub layer, which yields flow turbulence, separation and reattachment leading to a higher heat transfer coefficient. The enhancement of heat transfer by flow separation and reattachment caused by ribs is significantly higher compared to that by the increased heat transfer area due to ribs (fin-effect) [3]. The heat transfer measurements results for two different steps, p/e = 14 and p/e = 8, indicate the importance of roughness geometry [4].…”

mentioning

confidence: 88%

Effect of roughness shape on heat transfer and flow friction characteristics of solar air heater with roughened absorber plate

Chaube¹,

Sahoo²,

Solanki³

2006

WIT Transactions on Engineering Sciences, Vol 53

View full text Add to dashboard Cite

A 2-D computational analysis is carried out to assess the comparative performance of the absorber plate of a solar air heater with different roughness elements using commercial software package Fluent 6.1. The assessment is based on heat transfer enhancement with minimum pressure penalty. Ten different rib shapes (viz. Rectangular, Square, Chamfered, Triangular, Semicircle etc) are investigated at the Reynolds number range from about 3000-20000, in which solar air heaters normally operate. The SST kω turbulence model is selected by comparing the predictions of different turbulence models with experimental results available in the literature. Using the selected turbulence model a computational analysis is carried out to predict the heat transfer performance and flow friction characteristics of absorber plates with 10 different rib roughness elements. The analysis is carried out for both the flow regimes i.e. transitional flow regime (5 ≤ e + ≤ 70) and fully rough regime (e + ≥ 70).

show abstract

mentioning

confidence: 88%

Effect of roughness shape on heat transfer and flow friction characteristics of solar air heater with roughened absorber plate

Chaube¹,

Sahoo²,

Solanki³

2006

WIT Transactions on Engineering Sciences, Vol 53

View full text Add to dashboard Cite

show abstract

“…The ribs break the laminar sub-layer and create local wall turbulence due to flow separation and reattachment between consecutive ribs, which reduce thermal resistance and greatly augment the heat transfer. The enhancement of heat transfer by flow separation and reattachment, caused by ribs, is significantly higher than compared to the fin-effect, linked to the increased heat transfer area (Lee and Abdel Moneim, 2001). However, the use of artificial roughness results in higher friction losses leading to excessive power requirement for the air flow through the duct.…”

Section: Introductionmentioning

confidence: 96%

Numerical Study of Air Forced Convection in a Channel Provided With Inclined Ribs

Manca¹,

Nardini²,

Ricci³

2011

Frontiers in Heat and Mass Transfer

View full text Add to dashboard Cite

Convective heat transfer may be enhanced passively by adopting rough surfaces. Ribs break the laminar sub-layer and create local turbulence in the channel, reducing thermal resistance and enhancing the heat transfer. However, higher losses are expected. In this paper a numerical investigation is carried out on air forced convection in a rectangular ribbed channel. A three-dimensional model is developed to study the effect of the angle between the fluid flow direction and the ribbed surface, provided with rectangular turbulators, in the turbulent flow. Simulations s that Nusselt numbers as well as the pressure drops increase as the inclination angles increase.

show abstract

“…Consequently, wire windings have been found to be thermodynamically advantageous for the values of Reynolds number up to 13,000 (Yakut and Şahin, 2004). Lee and Abdel-Moneim (2001), using CFD models, studied heat transfer and flow behavior in a horizontal channel to one surface of which twodimensional turbulators were mounted. Study was by constant heat flux.…”

Section: Introductionmentioning

confidence: 99%

Experimental InvestigationOf The Effect Of Turbulators On Heat Transfer In Horizontal Tubes

Karagöz¹,

Abdi²,

Ömeroğlu³

2017

AKU-J. Sci. Eng.

View full text Add to dashboard Cite

The interest in increasing heat transfer is growing in line with industrial development. In relation to the cooling and heating systems, in particular in industrial-type boilers, the heating boilers and heat exchangers, the use of inserts to enhance heat transfer is quite common. During the design of the heat exchanger while increasing heat transfer, the friction hence the pressure loss will increase as well. As a matter of course, the cost of increased energy consumption for pumping fluid in tubes should be compensated with the reduction in cost of the device. In this experimental study, turbulence creating flaps have been placed into the tubes and compared to the empty tube. Experiments have been carried out using three springs and three twisted tapes having different pitches, and five different Reynolds numbers. The effects on the friction factor and on the number of Nusselt were investigated. Yatay Borulardaki Isı Transferine Türbülatörlerin Etkilerinin Deneysel Olarak Incelenmesi AnahtarkelimelerTürbülatör; Isı transferi; Basınçdüşümü; Yatayboru ÖzetIsı transferini artırmaya olan ilgi endüstriyel gelişme doğrultusunda artmaktadır. Soğutma ve ısıtma sistemleri ile ilişkili, özellikle endüstriyel tip kazanlar, ısıtma kazanları ve ısı eşanjörlerinde, ısı transferini artırmak için türbülatörlerin kullanımı oldukça yaygındır. Eşanjör tasarımında ısı transferini arttırırken , sürtünme dolayısıyla basınç kaybı da artar. Doğal olarak, borulardaki sıvıyı pompalamak için artan enerji tüketiminin maliyeti, cihazın maliyetindeki düşüş ile telafi edilmelidir. Bu deneysel çalışmada türbülans oluşturan kanatlar, tüplere yerleştirildi ve boş tüp ile karşılaştırıldı. Deneyler, farklı aralıklara sahip üç yay ve üç bükülmüş levha ile beş farklı Reynold sayısını kullanarak gerçekleştirildi. Sürtünme faktörü ve Nusselt sayısına etkileri araştırıldı.. © AfyonKocatepeÜniversitesi

show abstract

Computational analysis of heat transfer in turbulent flow past a horizontal surface with two-dimensional ribs

Cited by 51 publications

References 16 publications

Effect of roughness shape on heat transfer and flow friction characteristics of solar air heater with roughened absorber plate

Effect of roughness shape on heat transfer and flow friction characteristics of solar air heater with roughened absorber plate

Numerical Study of Air Forced Convection in a Channel Provided With Inclined Ribs

Experimental InvestigationOf The Effect Of Turbulators On Heat Transfer In Horizontal Tubes

Contact Info

Product

Resources

About