September 01, 2016

Principle-based design of distributed two-phase flow for fluid and heat transport

  • Stafford J.

The design of real systems incorporating multiphase flows remains a significant challenge for applications including biofluidics, microreactors and heat exchangers. Segmented two-phase flow without phase change is common to such applications, for the purpose of distributing biological samples from one site to many and for enhancing heat and mass transport over conventional laminar single phase flow. This paper theoretically examines flow configurations that can efficiently transport a segmented gas-liquid flow over an area. In the first part, fundamental design rules have been determined using the constructal method to minimize flow resistance of elemental bifurcations. It was determined that the geometric diameter ratio follows an alternative to the established Murray's law (also known as the Hess-Murray law) when the global pressure difference is dominated by short liquid slugs and the gas bubble phase. Using the findings for an elemental bifurcation, the second part investigates both single scale and multiple scale hierarchical configurations for combined fluid and heat transport. The multiple scale tree-shaped design can be advantageous in the controlled transport of segmented phases over an area and for low thermal resistance and pumping power requirements compared to a single scale serpentine channel layout. The principle-based method and results from this study can be used to reduce the design space in high-fidelity investigations of mini- and microscale segmented flows for fluid and heat transport purposes.

View Original Article

Recent Publications

October 30, 2016

43 Years of Actors: a Taxonomy of Actor Models and Their Key Properties

The Actor Model is a message passing concurrency model that avoids common concurrency issues such as low-level data races and deadlocks by construction. This has made the Actor Model an interesting concurrency model that has been used in various concurrency settings both in research as well as in industry, ranging ...

October 01, 2016

Practical Hardware Considerations for the Design of Hybrid Precoding Systems

  • Rulikowski P.
  • Venkateswaran V.

In this paper we describe practical implications of employing communication schemes with analog beamforming networks (ABFN). Specifically, we formulate realistic constraints for standard ABFN based on the S-parameters of the hardware components involved in their implementation. We concentrate on flexible fully-connected ABFN and Butler networks for im- plementing the discrete ...

October 01, 2016

The hydrodynamic and heat transfer behaviour downstream of a channel obstruction in the laminar flow regime

  • Jeffers N.
  • Punch J.
  • Stafford J.
  • Waddell A.

Microfluidic systems have been proposed as potential solutions for the cooling of next-generation Integrated Circuits (ICs) and Photonics Integrated Circuits (PICs). For PICs, integration of microfluidics may enable greater laser-bar array densities and, consequently, greater transmission bandwidth. To cool the micrometer scale hot-spots produced by the laser-bars, a passively actuated ...