Compact thermal modeling in electronics design Sarang Shidore Flomerics Inc Introduction The challenge of accurately predicting junction temperatures of IC components in system-level CFD simulations has engaged the engineering community for a number of years. The primary challenge has been that near-exact physical models of such components (known as detailed thermal models, or … [Read more...]
About viscosity
Table 1. Dynamic Viscosity Values for Various Gases and Liquids When we look at a fluid parcel subject to a velocity gradient in the direction perpendicular to the direction of the flow, we observe that this fluid parcel deforms. This type of deformation is called shear. The ability to withstand shear is a material property called the dynamic viscosity m. The viscosity … [Read more...]
Synthetic jets for forced air cooling of electronics
Introduction As increasing functionality is packaged into ever-shrinking electronics, cooling requirements rise exponentially. While there have been continued advances in high heat flux technologies [1], commercial, consumer-oriented systems continue to focus on aircooling for reasons of reliability, acoustics, cost and portability [2]. In order to support the increasing power … [Read more...]
Moisture permeation in electronics
Environmental control for electronic packages and enclosures often involves understanding and managing moisture concentration. Excessive moisture combined with processing temperatures can cause damage. High humidity levels have other potentially harmful effects such as corrosion. Since the movement of heat and moisture are similar (i.e., diffusive), thermal engineers may be … [Read more...]
Using a simple air recirculation model to explore computer rack cooling
Figure 1. Schematic diagram of simple computer rack air recirculation model. Figure 2. Schematic diagram of computer rack air recirculation model with heat exchanger in rear of computer rack. In an article in the November 2006 issue of ElectronicsCooling it was noted that “advances in computer clusters have resulted in the introduction of higher density server … [Read more...]
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