Small Fans for Cooling Small Electronic Devices Masaharu Miyahara, Sunonwealth Electronic Machine Industry Co., Ltd. The growing portable device market boosts the development of small electric devices, such as Ultra Mobile PC, Pico projector, Smart Phone, etc. One laptop cooling solution is the fan-less cooling technology that transports the CPU heat by using a heat pipe. … [Read more...]
Advanced Aerodynamics for Electronics Cooling Fans
Introduction The performance of electronics cooling fans has been steadily increasing as flow requirements chase higher thermal loading. These advances have been primarily achieved through mechanical and architecture changes. However, the aerodynamic sophistication of these fans has progressed to a lesser degree, and is far removed from turbomachines used in higher power … [Read more...]
Using an Equivalent Heat Transfer Coefficient to Model Fins on a Fin
Many readers of ElectronicsCooling are probably familiar with the use of fin efficiency formulas to estimate the thermal resistance of the commonly used parallel plate fin heat sink. Given the heat transfer coefficient, h, acting on a fin and the dimensions of the fin, the thermal resistance of an individual fin is given by: where Af and η are the surface area and … [Read more...]
Future trends in heat sink design
In today's electronics equipment, total system dissipated power levels are increasing with every new design. Increases in power levels combined with the market expectation of reduced package sizes lead to heat problems that, if uncontrolled, can significantly shorten the life of the electronics. Although this "increased power - decreased size" scenario has been prevalent for … [Read more...]
The treacherous streams
During the development of a telecommunications product, an unpredictable phenomenon of air streams within the maze of cards and module was encountered. It could only be compared to suddenly confronting powerful inner streams in a calm ocean. Unlike the ocean, however, these streams appeared in a man-made machine. It seemed as if someone had rewritten the laws of physics. It was … [Read more...]
