Rough surfaces with enhanced heat transfer for electronics cooling by direct metal laser sintering

By L. Ventola, F. Robotti, M. Dialameh, Flaviana Calignano, Diego Manfredi, Eliodoro Chiavazzo, Pietro Asinari. 2014

196 citations recorded by the source corpus.

Abstract Experimental evidences are reported on the potential of direct metal laser sintering (DMLS) in manufacturing flat and finned heat sinks with a remarkably enhanced convective heat transfer coefficient, taking advantage of artificial roughness in fully turbulent regime. To the best of our knowledge, this is the first study where artificial roughness by DMLS is investigated in terms of such thermal performances. On rough flat surfaces, we experience a peak of 73 % for the convective heat transfer enhancement (63% on average) compared to smooth surfaces. On rough (single) finned surfaces, the best performance is found to be 40% (35% on average) compared to smooth finned surface. These results refer to setups with Reynolds numbers (based on heated edge) within 3500 ≲ Re L ≲ 16 , 500 (corresponding to 35 , 000 ≲ Re D ≲ 165 , 000 in terms of Reynolds number based on hydraulic diameter). Experimental data are obtained by a purposely developed sensor with maximum and mean estimated tolerance intervals of ± 7.0% and ± 5.4%, respectively. Following the idea by Gioia et al. (2006) [48], we propose that heat transfer close to the wall is dominated by eddies with size depending on the roughness dimensions and the viscous (Kolmogorov) length scale. An excellent agreement between the experimental data and the proposed analytical model is finally demonstrated.

Subfields: Computational Mechanics, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/af56a24b3fb31b6d8ae11145382acc6e4244a346

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Computational Mechanics

1. Swee Hock Yeo
2. K. Tan
3. K. Thole

In Mechanical Engineering

1. Swee Hock Yeo
2. Timothy W. Simpson
3. K. Tan
4. K. Thole
5. Edward W. Reutzel

Citations in the corpus

• Surface modification of additive manufactured components by ultrasonic cavitation abrasive finishing (2017, background): “For instance, fins manufactured by DMLS have been shown to exhibit a significantly higher convective heat transfer coefficient due to its high surface roughness [20].”
• Design and evaluation of an additively manufactured aircraft heat exchanger (2018, methodology): “[12] used PBF AM to intentionally create different amounts of surface roughness on an external heat sink fin.”
• Roughness Effects on Flow and Heat Transfer for Additively Manufactured Channels (2015, background): “Few studies were found in the literature to have investigated convective heat transfer of specimens made with AM [4,12,13].”