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Single-Phase Convection Heat Transfer
Published in Randall F. Barron, Gregory F. Nellis, Cryogenic Heat Transfer, 2017
Randall F. Barron, Gregory F. Nellis
Figure 6.14 illustrates the Kapitza conductance predicted using the average of the phonon radiation and acoustic mismatch models as well as the value predicted using the Mittag correlation as a function of the fluid temperature. Note that the discrepancy is relatively unaffected by temperature and also that the value increases rapidly with temperature. Kapitza resistance becomes dominant at low temperature where the Kapitza conductance becomes very small.
Nanoscale Energy Transport
Published in Klaus D. Sattler, st Century Nanoscience – A Handbook, 2019
Jafar Ghazanfarian, Zahra Shomali, Shiyun Xiong
The Kapitza resistance is defined to measure the thermal interface resistance between a pair of solids or a solid and a liquid. When a phonon tries to pass across an interface, the phonon scattering takes place and the temperature discontinuity appears along the interface as a non-Euclidean surface. The interfacial effects are more dominant in nanoscale geometries since the interface has a great influence on thermal behavior of the bulk material.
Nanoscale Effects in Multiphase Flows and Heat Transfer
Published in Anupama B. Kaul, Microelectronics to Nanoelectronics, 2017
Navdeep Singh, Donghyun Shin, Debjyoti Banerjee
Interfacial thermal resistance represents a barrier to heat flow at the boundary between two phases or two dissimilar materials. Thermal resistance at the interface was first reported by Kapitza, with his measurement of the temperature drop at the interface between helium and a solid (Kapitza, 1941). Hence, the interface thermal resistance is also known as Kapitza resistance.
Interfacial thermal conductance between gold and SiO2: A molecular dynamics study
Published in Nanoscale and Microscale Thermophysical Engineering, 2022
S. Milad Hatam-Lee, Fatemeh Jabbari, Ali Rajabpour
Heat treatment of cancer has recently received a great deal of attention [1–4]. In this method, with the help of a laser pulse, the cancerous tissue is heated and the temperature reaches 40–43°C, which kills the cancer cells. In the heating method, metal nanoparticles are injected into the tissue to increase the thermal efficiency and better control of the heated area, as well as to distribute the heat uniformly. Among metal nanoparticles, gold received much more attention, due to its superior optical, electronic, thermal, and molecular-recognition properties [5–7]. These nanoparticles heat up much faster than cancer tissue and then transfer heat to their surrounding area and the cancer tissue [8, 9]. However, in the heat transfer from the nanoparticle to the environment, due to the physical and chemical differences between the two areas, a thermal resistance which is called interfacial thermal resistance (ITR) or kapitza resistance, appears. This resistance acts as a bridge between the nanoparticles and the surrounding environment, which can be assumed water in the cancer thermal therapy.
Molecular dynamics simulation study of heat transfer across solid–fluid interfaces in a simple model system
Published in Molecular Physics, 2022
Sebastian Schmitt, Truong Vo, Martin P. Lautenschlaeger, Simon Stephan, Hans Hasse
The heat transfer between a solid and a fluid phase requires energy transfer between the particles in the solid and those in the fluid. There is a heat transfer resistance associated with this, which is known as Kapitza resistance [2] and often expressed in terms of the Kapitza length [3]. In heat transfer theory, the Kapitza length plays a similar role as the slip length in fluid dynamics, which replaces on the microscale the assumption of zero slip used for describing macroscopic flow processes. In macroscopic heat transfer theory, the Kapitza resistance is usually neglected and replaced by the assumption of thermal equilibrium between both phases at the interface.
Two- and three-dimensional simulation of natural convection flow of CuO-water in a horizontal concentric annulus considering nanoparticles’ Brownian motion
Published in Numerical Heat Transfer, Part A: Applications, 2019
Wei Wang, Ben-Wen Li, Zheng-Hua Rao, Gang Liu, Sheng-Ming Liao
In recent years, more and more researchers begin to emphasize the importance of the interfacial thermal resistance between nanoparticles and base fluids. The interfacial thermal resistance (Kapitza resistance) is believed to exist in the adjacent layers of the two different materials and play a key role in weakening the effective thermal conductivity of the nanoparticle. Li [32] reported that the magnitude of between copper oxide nanoparticle and water is about By introducing such interfacial thermal resistance, the original nanoparticle thermal conductivity in the static part (Eq. (20)) is substituted by the effective nanoparticle thermal conductivity in the form: