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SPREADING ENHANCEMENTS IN THE THERMAL DESIGN OF FORCED CONVECTION TABLETS
Keywords: Tablet thermal management, Spreading enhancements, non-conventional techniques
Tablet computers, due to their advantages in size, weight, touch-interactive features, and the availability of mobile broadband data, are increasingly replacing laptop computers. As the performance of these tablets comes closer to matching that of laptops, applications that require high performance computing have become accessible from these devices. The increase of computational performance in such small form factors is mainly limited by the available thermal management technologies. The skin temperature of the tablet and the acoustic noise of these hand-held devices are of greater importance than for a conventional laptop due to closer human interactions. Due to these constraints there has been increasing demands made on the thermal engineers working on tablet devices. Therefore, the current thermal management strategies need to be improved to meet the growing performance demand. This work focuses on non-conventional heat rejection techniques such as thermal ground plane (TGP) and graphite spreaders are introduced in the tablet to enhance the spreading. An experimental and computational analysis of thermal design enhancements of forced convection tablets. A commercially available tablet is characterized experimentally using airflow bench tests, infrared thermography, thermocouple measurements, and acoustic tests. The thermal resistance data of the processor is obtained by dynamic thermal characterization using Mentor Graphics T3ster. A Compact Thermal Model (CTM) obtained from that data, is used to build the system-level thermal model of the tablet. The computational model of the tablet is built in FloTHERM XT and calibrated as a numerical test vehicle to perform such as analysis of the effectiveness of spreading enhancements
Bharath Nagendran,
Electronics Cooling Solutions Inc.
Santa Clara, CA
USA


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