Abstract With the development of computer processors, the size of chip has become smaller. But the processors used in high-power needs high performance of heat dissipation. In electronic design of the thermal management, the heat sink is the most basic application. Since the natural convection can not cool down effectively, it needs to use the forced convection cooling. The purpose of this study explored water-cooled sink as the heat source for the high-power chip. The study findings show that the ATC cooling chip enhances the potency and decreased the noise. Most importantly, it dissipates heat. In the present study, the researcher used Computational Fluid Dynamics to analyze the heat flow problem. By applying three variables in terms of the flow channel, the housing size, and the heat sink size in data analyses, the researcher classified different types of water-cooled sink. From the discussion of different flow rate and the thermal resistance, it shows that the trend curve of the fin-gilled sink is different from others. It also shows that it performs better in the low flow rate. After all using each method of heat dissipation, the potency of N-type channel sink is the best. When flow rate is 2.2 L/min, the thermal resistance is 0.0971˚C/W.

This thesis seeks to examine the effective convective heat exchange of sand as a heat exchange medium. The goal of this exploratory research is to quantify the heat transfer coefficient of sand in a proposed Thermal Energy Storage (TES) system which intends to complement solar thermal power generation. Standard concentrator solar thermal power plants typically employ a heat transfer fluid (HTF) that is heated in the collector field then routed to the power generators or TES unit. A fairly clear option for a TES system would be to utilize the existing HTF as the working storage medium. However, the use of conventional HTF systems may be too expensive. These fluids are quite costly as the quantity needed for storage is high and for some fluids their associated high vapor pressures require expensive highly reinforced containment vessels. The proposed storage system seeks to use sand as the storage medium; greatly reducing the expenses involved for both medium and storage costs. Most prior TES designs using sand or other solids employed them in a fixed bed for thermal exchange. The proposed TES system will instead move the sand to drive a counter flow thermal exchange. This counter flow design allows for a much closer temperature of approach when compared to a fixed bed. As cost and performance are the primary goals to tackle of the proposed system, the evaluation of the sandâ s thermal exchange effectiveness in a flowing state is necessary. Experiments will be conducted to measure the effective heat transfer coefficient between the sand and representative solid surfaces used as the heat transfer conduits. Additional experiments that will be looked at are wear caused by the sand as a consideration for long term design viability as well as angle of repose of the sand and its effect on scoop design for improved materials handling. Key investigational aspects of these experiments involve the sand grain size as well as shape of the heat exchanger surfaces. The thesis will evaluate the resulting convective heat transfer coefficient of the sand as related to these features. The data will then be compared and verified with available literature of previously studied characteristic thermal properties of sand. The measured and confirmed data will then be used to further aid in a design model for the proposed TES system.

Thesis (Ph. D.)--Lehigh University, 2000. / Includes vita. Includes bibliographical references (leaves 179-183).

Dissertation : Physics : Chicago : 1917. / Notes bibliographiques.

Thesis (M.S.)--West Virginia University, 1999. / Title from document title page. Document formatted into pages; contains xviii, 177 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 140-141).

Thesis (Ph. D.)--Rutgers University, 2009. / "Graduate Program in Food Science." Includes bibliographical references (p. 241-246).

Proefschrift--Leyden. / Summary in Dutch. Auto-biographical note. "Stellingen": [2] p. laid in. Bibliography: p. 91-94.

Promotionsarbeit--Eidgenössische Technische Hochschule, Zürich. / Lebenslauf.

Thesis (Ph. D.)--University of Texas at Austin, 2003. / Vita. Includes bibliographical references. Available also from UMI Company.

Thesis (M.S.)--Brigham Young University. Dept. of Mechanical Engineering, 2004. / Includes bibliographical references (p. 107-110).