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Article

Enhanced Specific Heat Capacity of Liquid Entrapped between Two Solid Walls Separated by a Nanogap

1
Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
2
Department of Mechanical Engineering, Bangladesh University of Engineering and Technology, Dhaka 1000, Bangladesh
3
Department of Mathematical Sciences, University of South Carolina Aiken, Aiken, SC 29801, USA
*
Author to whom correspondence should be addressed.
Processes 2020, 8(4), 459; https://doi.org/10.3390/pr8040459
Received: 10 March 2020 / Revised: 6 April 2020 / Accepted: 9 April 2020 / Published: 13 April 2020
Size and thermal effect on molar heat capacity of liquid at constant volume (Cv) on a nanometer scale have been investigated by controlling the temperature and density of the liquid domain using equilibrium molecular dynamics (EMD) simulations. Lennard-Jones (LJ) type molecular model with confinement gap thickness (h) 0.585 nm to 27.8 nm has been used with the temperature (T) ranging from 100 K to 140 K. The simulation results revealed that the heat capacity of the nanoconfined liquid surpasses that of the bulk liquid within a defined interval of gap thickness; that the temperature at which maximum heat capacity occurs for a nanoconfined liquid vary with gap thickness following a power law, TCv,max = 193.4 × (h/a)−0.3431, ‘a’ being the lattice constant of Argon (solid) at 300 K; and that for a specified gap thickness and temperature, the confined liquid can exhibit a heat capacity that can be more than twice the heat capacity of the bulk liquid. The increase in heat capacity is underpinned by an increase in non-configurational (phonon and anharmonic modes of vibration) and configurational (non-uniform density distribution, enhanced thermal resistance, guided molecular mobility, etc.) contributions. View Full-Text
Keywords: heat capacity; EMD simulation; LJ molecular model; nanogap confined liquid; gap thickness; configurational contributions; non-configurational contributions heat capacity; EMD simulation; LJ molecular model; nanogap confined liquid; gap thickness; configurational contributions; non-configurational contributions
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MDPI and ACS Style

Mahmud, R.; Morshed, A.K.M.M.; Paul, T.C. Enhanced Specific Heat Capacity of Liquid Entrapped between Two Solid Walls Separated by a Nanogap. Processes 2020, 8, 459. https://doi.org/10.3390/pr8040459

AMA Style

Mahmud R, Morshed AKMM, Paul TC. Enhanced Specific Heat Capacity of Liquid Entrapped between Two Solid Walls Separated by a Nanogap. Processes. 2020; 8(4):459. https://doi.org/10.3390/pr8040459

Chicago/Turabian Style

Mahmud, Rifat, A.K.M. Monjur Morshed, and Titan C. Paul. 2020. "Enhanced Specific Heat Capacity of Liquid Entrapped between Two Solid Walls Separated by a Nanogap" Processes 8, no. 4: 459. https://doi.org/10.3390/pr8040459

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