The presented work analyses the design space and performance potential of microfabricated Brayton cycle and Rankine cycle devices, accounting for lower component efficiencies, temperatures limited by the material properties and system implementation constraints imposed by silicon microfabrication and miniaturization. By exploring the design space of such microsystems, their potential thermal ef...

Details of design and fabrication of a beamline RF load suited to accommodate SRF cavities are presented. Bonding an RF absorber to a heat sink is the key aspect of the load. Production loads have been effectively tested to 10.8 kW and operated in situ up to 3 kW.

Due to the high performance of electronic components, the heat generated is increasing dramatically and cooling system for such components becomes one of the most important issues to dissipate heat that generated in electronic component. In the present analysis, a microchannel heat sink configuration is simulated by modelling the stacked microchannel heat sinks in macroscopic scale as if it is ...

We introduce a class of anchoritic sensor networks, where communications between sensor nodes is undesirable or infeasible, due to, e.g., harsh environment, energy constraints, or security considerations. Instead, we assume that the sensors buffer the measurements of the physical phenomena over the lifetime, and report measurements directly to a sink (note that “report” does not necessarily req...

Suppose that the velocity field is inversely proportional to the radial distance, v = Q 2πr . Such a divergenceless field is natural in two dimensions and is generated by a point sink (or source) of strength Q in an incompressible fluid. This flow field has the remarkable property that the convection term can be absorbed into the diffusion operator by an appropriate shift of the spatial dimensi...

This study provides a comprehensive methodology for optimizing the design of a twophase micro-channel heat sink. The heat sink parameters are grouped into geometrical parameters, operating parameters, and thermal/fluid parameters. The objective of the proposed methodology is to optimize micro-channel dimensions in pursuit of acceptable values for the thermal/fluid parameters corresponding to a ...

The Boltzmann transport equation is often used for non-continuum transport when the mean free path of phonons is of the order of device sizes. One particular application involves heat generation in electronic devices. In a highly scaled MOSFET, for example, the majority of the heat is produced in a localized region immediately below the gate on the drain side. The size of this generation region...

Shake a bottle of champagne and pop it open. The champagne will shoot out in a mini-eruption. Do the same to a bottle of beer. Beer will ooze out more slowly. If a bottle of champagne or beer is opened without perturbation, there will be no eruption, but bubbles will rise and grow, often in regularly spaced “trains” (FIG. 1). In Guinness beer, bubbles rise more slowly and may even sink. The myr...

3135 S. State St. Suite 108 Ann Arbor MI 48108 Phone: 734-761-1956 Fax: 734-761-9855 Email: [email protected] Optimum fin spacing for fan-cooled heat sinks

Wireless sensors are employed in a wide range of applications. One common feature of most sensor settings is the need to communicate sensed data to some collection point or sink. This communication can be direct (to a mobile collector) or indirect – via other sensors towards a remote sink. In either case, a sensor might not be able to communicate to a sink at will. Instead it collects data and ...