February 20, 2010

Experimental Performance of Novel Foam and Schwarz Surface Heat Sinks

  • Hernon D.

In this experimental investigation two novel heat sink designs that employ different flow phenomena for enhanced heat transfer are presented. Thermal and hydrodynamic performance comparisons are made for three foam heat sinks with and without fins and two heat sinks with zero-mean curvature based on the Schwarz minimal surface design. Results for a longitudinally-finned heat sink are presented as a baseline comparison against the complex foam and Schwarz 3D” heat sink designs. The heat sinks are manufactured using an investment casting process providing a means of fabricating complex designs as one monolithic piece with high thermal conductivity that would not be possible using traditional techniques. It is demonstrated that against pumping power and velocity parameters the foam structures perform reasonably well in the higher velocity range. It is shown that the pressure drop across the foam and Schwarz structures is significant and the application of these designs in real systems will depend on the design constraints of the system, e.g. the foams may work well in a fan mounted heat sink assembly but not in a typical telecommunications application where flow bypass is important.

Recent Publications

August 09, 2017

A Cloud Native Approach to 5G Network Slicing

  • Francini A.
  • Miller R.
  • Sharma S.

5G networks will have to support a set of very diverse and often extreme requirements. Network slicing offers an effective way to unlock the full potential of 5G networks and meet those requirements on a shared network infrastructure. This paper presents a cloud native approach to network slicing. The cloud ...

August 01, 2017

Modeling and simulation of RSOA with a dual-electrode configuration

  • De Valicourt G.
  • Liu Z.
  • Violas M.
  • Wang H.
  • Wu Q.

Based on the physical model of a bulk reflective semiconductor optical amplifier (RSOA) used as a modulator in radio over fiber (RoF) links, the distributions of carrier density, signal photon density, and amplified spontaneous emission photon density are demonstrated. One of limits in the use of RSOA is the lower ...

July 12, 2017

PrivApprox: Privacy-Preserving Stream Analytics

  • Chen R.
  • Christof Fetzer
  • Le D.
  • Martin Beck
  • Pramod Bhatotia
  • Thorsten Strufe

How to preserve users' privacy while supporting high-utility analytics for low-latency stream processing? To answer this question: we describe the design, implementation and evaluation of PRIVAPPROX, a data analytics system for privacy-preserving stream processing. PRIVAPPROX provides three properties: (i) Privacy: zero-knowledge privacy (ezk) guarantees for users, a privacy bound tighter ...