VISUAL STUDY OF FLUID DYNAMICS IN WICKLESS TRANSPARENT HEAT PIPES

  • Kempers R.
  • Robinson A.
  • Siedel S.
  • Smith K.

Though heat pipes are recognized as a viable heat transfer device for many different applications, the thermal mechanisms driving the heat transfer are still not fully understood. By fabricating and testing a transparent sapphire heat pipe, with water as the working fluid, the dominant mechanisms of boiling and condensation were visualized. The results of this investigation suggest that for low operating pressures there is a complex geyser boiling regime occurring in the evaporator section, at lower powers (~20 W) slugs of water were observed, and explosive boiling was noted at higher powers (~70 W). These phenomena were observed using high speed imagery and comparisons made with the corresponding local temperature.

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 ...