Thermal Constriction Resistance

Madhusudana, C. V.

doi:10.1007/978-3-319-01276-6_2

Cited by 3 publications

(1 citation statement)

References 19 publications

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“…where h = 1.65 × 10 8 W m −2 K −1 is the thermal contact conductance which is defined as the reciprocal of thermal contact resistance [44]. T(x, y, z l , t) represents the temperature at the end of the material simulated, which is 5 µm inside the substrate.…”

Section: Refining the Modelmentioning

confidence: 99%

Modeling photothermal effects in high power optical resonators used for coherent levitation

Gu,

Qin,

Guccione

et al. 2023

New J. Phys.

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Radiation pressure can be used to enable optomechanical control and manipulation of the quantum state of a mechanical oscillator. Optomechanical interaction can also be mediated by photothermal effects which, although frequently overlooked, may compete with radiation pressure interaction. Understanding of how these phenomena affect the coherent exchange of information between optical and mechanical degrees of freedom is often underdeveloped, particularly in mesoscale high-power systems where photothermal effects can fully dominate the interaction. Here we report an effective theoretical model to predict and successfully reconstruct the dynamics of a unique optomechanical system: a cavity-enhanced setup for macroscopic optical levitation, where a free-standing mirror acts as the optomechanical oscillator. We decompose the photothermal interaction into two opposing light-induced effects, photothermal expansion, and thermo-optic effects. We then reconstruct a heuristic model that links the intracavity field to four types of cavity length changes caused by acoustic ( x ac ), centre of mass ( x lev ), photothermal ( x ex ) and thermo-optic ( x re ) displacements. This offers refined predictions with a higher degree of agreement with experimental results. Our work provides a means to precisely model the photothermal effect of high power optomechanical systems, as well as for developing more precise photothermal modeling of photonics systems for precision sensing and quantum measurements.

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Section: Refining the Modelmentioning

confidence: 99%

Modeling photothermal effects in high power optical resonators used for coherent levitation

Gu,

Qin,

Guccione

et al. 2023

New J. Phys.

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Optothermal Control of Local Fluid Temperature in Microfluidics

Akbari

Bahrami

Sinton

2010

ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels: Parts a and B

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This paper outlines an optothermal approach to manipulate local fluid temperatures in microfluidic and lab-on-chip systems. The system has the ability to control the size, location and the source heat flux using an external computer and is not constrained by predefined geometries, complex fabrication or control system. The thermal performance is evaluated using a temperature-dependent fluorescent dye. Experiments demonstrate localized heating up to 35°C over ambient temperature for a heat source spanning a downstream length of 1.5 mm. Experimental results are compared with a 1D thermal analysis of the system based on the Taylor-Aris dispersion.

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Thermal Spreading Resistances in Rectangular Flux Channels: Part I Geometric Equivalences

Muzychka

Yovanovich

Culham

2003

36th AIAA Thermophysics Conference

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This paper presents a simple geometric tramsformation for predicting thermal spreading resistance in isotropic and compound rectangular flux channels using the solution for an isotropic or compound circular flux tube. It is shown that the results are valid for a wide range of channel aspect ratios and source to base coverage ratio. Since the circular disk solution requires a single series summation, it is preferable to the rectangular flux channel solution which requires the evaluation of two single series and one double series summation. NOMENCLATUREa, b = radial dimensions,m a, b, c, d = linear dimensions, m A b = baseplate area, m 2 A s = heat source area, m 2 A n , B n = Fourier coefficients Bi = Biot number, ht/k h = contact conductance or film coefficient, W/m 2

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Thermal Constriction Resistance

Cited by 3 publications

References 19 publications

Modeling photothermal effects in high power optical resonators used for coherent levitation

Modeling photothermal effects in high power optical resonators used for coherent levitation

Optothermal Control of Local Fluid Temperature in Microfluidics

Thermal Spreading Resistances in Rectangular Flux Channels: Part I Geometric Equivalences

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