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  • Laminar microchannel cooling of integrated circuits

    Creator:
    Lienau, Jeffrey Jay
    Abstract:
    Liquid cooled, laminar microchannel heat sinks were earlier proposed by Tuckerman for cooling high heat generating integrated circuits and high power microwave generation systems using photoconductive switches. A method of computationally analyzing the heat sinks is presented which produces the desired temperature and velocity distributions within the heat sinks. The...
    Resource Type:
    Masters Thesis
    Full Text:
    parameters of the design. The optimization involved a specified pressure drop across the heat sink. The

  • Microscale thermal management utilizing vapor extraction from a fractal-like branching heat sink

    Creator:
    Apreotesi, Mario A.
    Abstract:
    It is hypothesized that increases in pressure drop due to vapor generation during boiling in microchannels can be reduced by extraction of vapor at its point of inception. Ultimately, this local vapor extraction decreases the pressure drop required to drive the flow through a fractal-like branching, microchannel flow network within...
    Resource Type:
    Masters Thesis
    Full Text:
    electronic piece to be cooled, e.g. a computer. Initial microscale heat sink research focused on single

  • Single Phase and Flow Boiling Heat Transfer and Flow Characterization in Microscale Pin Fin Heat Sinks

    Creator:
    Rasouli, Erfan
    Abstract:
    The ever increasing requirements for heat dissipation in various thermal management applications such as computer chip cooling and high power electronics have necessitated the need for novel thermal management techniques. Thermal management using heat sinks with microscale features is amongst the prominent techniques developed over the past two decades. In...
    Resource Type:
    Dissertation
    Full Text:
    , single and phase change heat transfer and pressure drop through one such heat sink, namely microscale

  • A study of micro-scale, fractal-like branching flow networks for reduced pumping power and improved temperature uniformity

    Creator:
    Alharbi, Ali Y.
    Abstract:
    A first generation, one-dimensional predictive model is proposed for designing heat sinks with fractal flow networks. A three-dimensional computational fluid dynamics (CFD) model is analyzed as a means for validating the model and identifying areas for improvement. Two separate CFD models were developed. One was analyzed with conjugate heat transfer...
    Resource Type:
    Masters Thesis
    Full Text:
    . Also varied in the analyses were heat sink material, heat flux and flow rate. Qualitative results show

  • Modeling convective boiling flow with in-situ local vapor extraction

    Creator:
    Salakij, Saran
    Abstract:
    The pressure drop of convective boiling flow may be reduced by extracting vapor locally since the entire generated vapor does not have to travel through the entire channel length. In this study, the theoretical model was developed to simulate a convective boiling flow through a fractal-like branching microchannel network with...
    Resource Type:
    Masters Thesis
    Full Text:
    -like channel networks in a circular heat sink with symmetric branching and channel length ratios of a

  • Potential of Genetic Algorithms for Design of Liquid Cooled Heat Sinks Fabricated Using Additive Manufacturing

    Creator:
    Dokken, Connor B.
    Abstract:
    The advancement of new manufacturing techniques such as additive manufacturing enable significantly greater freedom of design compared to conventional techniques. Of significant interest is what improvements could be made in the design of cold plates and heat sinks for electronics cooling. Greater design freedom could potentially enable new designs that...
    Resource Type:
    Masters Thesis
    Full Text:
    power maps are used to develop optimized heat sink geometry, one being a generated symmetric map, and

  • A technique for spatially resolved wall temperature measurements in microchannel heat sinks using infrared thermography

    Creator:
    Krebs, Daniel P.
    Abstract:
    A non-intrusive measurement technique for direct quantitative thermal visualization of channel wall temperatures in two phase microchannel flows using infrared thermography (IRT) is presented. Specifically, the measurement of top channel wall temperatures in a fractal-like branching microchannel silicon heat sink during flow boiling is demonstrated and thoroughly documented. Obtaining quantitative...
    Resource Type:
    Masters Thesis
    Full Text:
    measurement of top channel wall temperatures in a fractal-like branching microchannel silicon heat sink

  • Microscale thermal management using membrane vapor extraction

    Creator:
    Apreotesi, Mario A.
    Abstract:
    With the miniaturization of microelectronics and increase of processor speeds in the last few decades, thermal management is drastically affecting overall packaging and system capabilities. Due to the special needs introduced, research focusing on microscale cooling has increased. This study combines the positive characteristics of single- and two-phase flows in...
    Resource Type:
    Honors College Thesis
    Full Text:
    outlet fluid temperature and the temperature of the fluid in the heat sink decrease at the expense of a

  • Fabrication and characterization of nanostructured surfaces for enhanced heat transfer

    Creator:
    Choi, Changho
    Abstract:
    This objective of this study is to investigate the capability of nanostructured surfaces on dissipating heat flux by performing pool boiling and convective flow boiling. The generation of ultra-high heat flux from high performance electric devices has motivated a number of investigations related to advanced heat transfer especially in two-phase...
    Resource Type:
    Masters Thesis
    Full Text:
    minichannel heat sink .......................... 56 4.2 Understanding of the flow distribution

  • 1/f noise of GaAs resistors on semi-insulating substrates, and 1/f noise due to temperature fluctuations in heat conduction

    Creator:
    Choi, Mun-Seork
    Abstract:
    This research work focuses on the mechanism of 1/f noise in GaAs resistors on semi-insulating substrates and 1/f noise due to temperature fluctuations in heat conduction in resistors, diodes, and bipolar transistors. The goal of this research is to generate accurate models to explain physical origin of 1/f noise in...
    Resource Type:
    Dissertation
    Full Text:
    generation and heat conduction towards the heat sink. The device temperature is only an average value and