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International Heat Transfer Conference 15

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Gas Molecular Momentum Exchange Characteristics in Nanopores

DOI: 10.1615/IHTC15.nmm.009136
pages 5555-5563

Qixin Liu
Chongqing University of Science and Technology

Zhiyong Cai
Chongqing University of Science and Technology


KEY WORDS: Nano/Micro scale measurement and simulation, Molecular transport, gas molecular momentum exhchange, molecular dynamics simulation

Abstract

The ’s convective thermal transfer ability is highly related with its flow characteristics. The unusual flow phenomena in the nanopores have attracted huge interests of scholars around the world. However, still now, there is no clear interpretation on the mechanisms of decreasing of friction coefficient in nanopores. The molecular momentum exchange characteristics physically determine the flow properties. So it’s every necessary to carefully study the gas molecular momentum exchange characteristics in nanopores. The present paper used the molecular dynamics simulations to study the gas molecular momentum exchange in nanopores. It is found that in nanopores there are two distinct zones in which the gas molecular momentum exchange’s directions are opposite. This finding is physically important because it interprets the fluid’s loss fraction near the wall surface. The momentum exchange transition regime is defined in this paper, it means the region in which the value of gas molecular momentum exchange transfers from positive to negative. In the transition regime the gas molecular momentum exchange obviously increases to transfer momentum to the gas molecules affected by the wall surface to reinforce the loss friction. So we think this transition regime plays an important role in determing the flow characters of gas confined in nanopores. These study results on the gas molecular momentum exchange by this paper might bring lights on the understanding of gas flow and heat transfer in nanopores.

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