Heat transfer enhancement in dimpled tubes

Chen, Juin; Müller‐Steinhagen, Hans; Duffy, G. G.

doi:10.1016/s1359-4311(00)00067-3

Cited by 138 publications

(33 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The dimples were formed on the outer surface of the test section as mentioned by Vicente et al [28]. Six different dimpled tubes with the depth and diameter of the dimples ranging between 0.5-1.5 mm and 2-5.5 mm, respectively were used to increase the values of heat transfer coefficient by Chen et al [29]. Hence in the present investigation, the dimples diameter and depth were maintained at a constant value of 3 mm and 0.6 mm, respectively.…”

Section: Experimental Set Upmentioning

confidence: 99%

Experimental studies on heat transfer and friction factor characteristics of CuO/water nanofluid under laminar flow in a helically dimpled tube

2011

View full text Add to dashboard Cite

An experimental investigation on the convective heat transfer and friction factor characteristics in the plain and dimpled tube under laminar flow with constant heat flux is carried out with distilled water and CuO/water nanofluids. For this, CuO nanoparticles with an average size of 15.3 nm were synthesized by sol-gel method. The nanoparticles are then dispersed in distilled water to form stable suspension of CuO/water nanofluid containing 0.1, 0.2 and 0.3% volume concentration of nanoparticles. It is found that the experimental Nusselt numbers for 0.1, 0.2 and 0.3% volume concentration of CuO nanoparticles are about 6, 9.9 and 12.6%

show abstract

Section: Experimental Set Upmentioning

confidence: 99%

Experimental studies on heat transfer and friction factor characteristics of CuO/water nanofluid under laminar flow in a helically dimpled tube

2011

View full text Add to dashboard Cite

show abstract

“…Chen. J [6] has done the analysis of how the distance and depth and concentration affect heat transfer, ending up with found a best way to design heat transfer enhancement. Bunker [7] found that compared dimple to smooth channel, dimple has twice heat enhancement and 2~7 times stronger friction.…”

Section: Introductionmentioning

confidence: 99%

A research of heat transfer enhancement of rectangular channel with dimples

Yue

Xizhi

et al. 2017

MATEC Web Conf.

View full text Add to dashboard Cite

this thesis is aimed to do numerical simulations on rectangular channel with a new model of dimple in different condition of channel height, dimple depth, dimple distance by using CFD program and RNG k-ε model. It is concluded that, the existence of dimple has changed the velocity and direction of the fluid, as well as the original flow status. Dimple increased the heat exchange area of rectangular channel and broke the boundary layer, enhanced the flow rate of fluid, as a result of enhanced heat transfer performance.

show abstract

“…Vicente et al [12] and Chen et al [13] experimentally studied the turbulent flow and heat transfer in tubes with helical and aligned dimples. But actually, these "dimples" on the internal surface of tube are protuberant, which should be called protrusions.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Heat Transfer Enhancement in a Receiver Tube of Parabolic Trough Solar Collector with Dimples, Protrusions and Helical Fins

Zhen

et al. 2015

Energy Procedia

105

View full text Add to dashboard Cite

Vacuum tubular receiver is the core component of parabolic trough solar collectors (PTCs). To enhance the heat transfer rate from solar radiation to heat transfer fluid (HTF), one of the effective techniques is to improve the convective heat transfer inside the inner tube. In this study, we focus the heat transfer of the HTF side. A numerical simulation on the fully developed turbulent flow and heat transfer in the inner tube with and without helical fins, protrusions and dimples has been investigated. The results show that the receiver tubes with dimples have superior performance of heat transfer augmentation compared with that with protrusions or helical fins. Then, the effects of the geometry sizes and arrangements of dimples on the convective heat transfer performance are further studied. The performance evaluation plot of heat transfer enhancement techniques show that dimples with deeper depth, narrower pitch and more numbers in the circumference direction is benefit for improving the performance of heat transfer enhancement while the varied arrangements have no obvious influence.

show abstract

Heat transfer enhancement in dimpled tubes

Cited by 138 publications

References 3 publications

Experimental studies on heat transfer and friction factor characteristics of CuO/water nanofluid under laminar flow in a helically dimpled tube

Experimental studies on heat transfer and friction factor characteristics of CuO/water nanofluid under laminar flow in a helically dimpled tube

A research of heat transfer enhancement of rectangular channel with dimples

Numerical Study on Heat Transfer Enhancement in a Receiver Tube of Parabolic Trough Solar Collector with Dimples, Protrusions and Helical Fins

Contact Info

Product

Resources

About