Enhancement effect of asymmetry on the thermal conductivity of double-stranded chain systems

Zhang, Mao-Ping; Zhong, Wei; Ai, Bao-quan

doi:10.1088/1674-1056/20/10/100508

Cited by 4 publications

(3 citation statements)

References 28 publications

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“…Various nonlinear models have been proposed to construct a thermal diode theoretically. [10,[14][15][16][17][18][19][20][21][22][23][24] Moreover, benefiting from the boost of nanotechnology, solid thermal diodes have been fabricated in experiments successfully by using specific materials, which paves the way for the practical applications of thermal diode and transistor. [25][26][27][28] These researches revealed that a onedimensional thermal diode model must satisfy two essential conditions: the nonlinear (unharmonic) interaction and asymmetric structure of the system.…”

Section: Introductionmentioning

confidence: 99%

Reversal of thermal rectification in one-dimensional nonlinear composite system

Zhan¹,

Huang²,

Huang³

2014

Chinese Phys. B

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Using nonequilibrium molecular dynamics simulations, a comprehensive study of the asymmetric heat conduction in the composite system consisting of the Frenkel-Kontorova (FK) model and Fermi-Pasta-Ulam (FPU) model is conducted. The calculated results show that in a larger system, the rectifying direction can be reversed only by adjusting the thermal bias. Moreover, the rectification reversal depends critically on the system size and the properties of the interface. The mechanisms of the two types of asymmetric heat conduction induced by nonlinearity are discussed. Considering the novel asymmetric heat conduction in the system, it may possess possible applications to manage the thermal rectification in situ directionally without re-building the structure.

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Section: Introductionmentioning

confidence: 99%

Reversal of thermal rectification in one-dimensional nonlinear composite system

Zhan¹,

Huang²,

Huang³

2014

Chinese Phys. B

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“…In fact, MD simulation has been a useful method to study thermal conductivity by phonons. [7][8][9][10][11][12][13][14][15][16][17][18][19] The anisotropy of thermal conductivity, [15] interface effect, [9,16] and size effect [7,10,11] on thermal conductivity were specially discussed. In MD simulations, the thermal conductivity can be computed either using equilibrium MD (EMD) [13,16,20,21] or non-equilibrium MD (NEMD).…”

Section: Introductionmentioning

confidence: 99%

“…In MD simulations, the thermal conductivity can be computed either using equilibrium MD (EMD) [13,16,20,21] or non-equilibrium MD (NEMD). [7,[9][10][11]14,[16][17][18][19] Relatively, the NEMD method provides direct information about transport phenomenon. [7,22] So in this paper, the phonon conductivity of alpha-zirconium is theoretically estimated using the NEMD method.…”

Section: Introductionmentioning

confidence: 99%

Study of lattice thermal conductivity of alpha-zirconium by molecular dynamics simulation

Wu¹,

Wang²,

Fu³

2013

Chinese Phys. B

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The non-equilibrium molecular dynamics method is adapted to calculate the phonon thermal conductivity of alpha-zirconium. By exchanging velocities of atoms in different regions, the stable heat flux and the temperature gradient are established to calculate the thermal conductivity. The phonon thermal conductivities under different conditions, such as different heat exchange frequencies, different temperatures, different crystallographic orientations, and crossing grain boundary (GB), are studied in detail with considering the finite size effect. It turns out that the phonon thermal conductivity decreases with the increase of temperature, and displays anisotropies along different crystallographic orientations. The phonon thermal conductivity in [0001] direction (close-packed plane) is largest, while the values in other two directions of [21̄1̄0] and [011̄0] are relatively close. In the region near GB, there is a sharp temperature drop, and the phonon thermal conductivity is about one-tenth of that of the single crystal at 550 K, suggesting that the GB may act as a thermal barrier in the crystal.

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