研究目的
To develop a multiscale model of field emission from carbon nanotube fibers that includes a detailed treatment of the heat exchange mechanisms in the array of carbon nanotubes located at the tip of the fiber.
研究成果
The model provides insights into the FE properties of CNFs, predicting the fraction of CNTs being destroyed and the fraction undergoing Henderson cooling or Nottingham heating as a function of the applied external electric field. This sheds new light on the FE properties of CNFs.
研究不足
The model neglects sidewall blackbody radiation of each CNT at the apex of the fiber, assuming that each CNT’s radiative sidewall heat loss is offset by the heat gain from all of its neighboring CNT’s sidewall blackbody radiation.
1：Experimental Design and Method Selection:
The model includes Joule heating within the fiber, radiative cooling at the fiber apex, and the transition from Nottingham heating to Henderson cooling in the CNTs. It uses numerical calculations of the current emitted from each CNT and the energy exchange at their tips.
2：Sample Selection and Data Sources:
The simulations were performed with a N×N array of CNTs, with linear distributions of length and radius over a maximum range from 2 to 4 μm and 5 to 8 nm, respectively.
3：List of Experimental Equipment and Materials:
The model assumes the temperature dependence of CNT resistivity and a constant thermal conductivity for each CNT.
4：Experimental Procedures and Operational Workflow:
The iterative process is carried out until the temperature of the CNF tip has reached a steady state value. The FE contribution from any CNT is removed once the temperature at its tip reaches its melting point.
5：Data Analysis Methods:
The model predicts the fraction of CNTs being destroyed as a function of the applied external electric field and the fraction of surviving CNTs undergoing Henderson cooling or Nottingham heating.
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