Graphite is available as a variety of different material forms, the most useful in the electronics cooling market being pyrolytic graphite, graphite fiber reinforced carbon and polymer matrix composites, graphite foams and, the subject of this brief, natural graphite. The basic structure of graphite is shown in Figure 1. Figure 1. Structure of graphite crystal. The … [Read more...]
Use of Naphthalene Sublimation Technique for Obtaining Accurate Heat Transfer Coefficients in Electronic Cooling Applications
The naphthalene sublimation technique has been demonstrated by a number of investigators to be an excellent method for obtaining heat transfer results [1,2] and a few have applied this technique to applications focused on electronic cooling [3-6]. These investigators have found that the mass transfer process can be set up with cleaner boundary conditions and can be studied more … [Read more...]
Vapor Compression Cooling for High Performance Applications
Vapor compression refrigeration is being adapted to cool computer and telecommunications equipment in a limited number of high performance applications. Vapor compression can lift large heat loads and can heat sink at below ambient temperatures. Cold plates can offset high case-to-junction temperature gradients to keep high power integrated circuits from overheating and/or can … [Read more...]
General aspects on fan selection and layout
Introduction and Description of Fan Types Small ventilators are generally called fans. Depending on the geometrical design of the impeller, various constructional types are distinguished to indicate the main direction of the airflow. Here are the descriptions of the most important types of fans: Axial Fans Axial fans are characterized by their typical impeller form, which … [Read more...]
Parameters affecting package thermal performance a low end system level example
Thermal management of electronic equipment is a dynamic process. For example, the anticipated power trends for CMOS technology can be found in the roadmaps of [1 and 2]. They closely follow the rapidly rising power trends seen in the 1980s for the bi-polar circuits [3] but with a time shift by a decade. It is a fortunate circumstance that a tremendous amount of heat transfer … [Read more...]
- « Previous Page
- 1
- …
- 101
- 102
- 103
- 104
- 105
- …
- 127
- Next Page »
