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research-article

Measurements of Adhesion Force between a Single Silver Particle Interacting with Hastelloy X and Inconel 617

[+] Author and Article Information
Naphtali M. Mokgalapa

South African Nuclear Energy Corporation, R104 Pelindaba, Brits Magisterial District, North West Province, 0240
naphtali.mokgalapa@necsa.co.za

Tushar Ghosh

University of Missouri, Department of Chemical Engineering, Columbia, Missouri, 65211
GhoshT@missouri.edu

Robert V. Tompson, Jr.

University of Missouri, Department of Mechanical and Aerospace Engineering, Columbia, Missouri, 65211
TompsonR@missouri.edu

Sudarshan K. Loyalka

University of Missouri, Department of Mechanical and Aerospace Engineering, Columbia, Missouri, 65211
LoyalkaS@missouri.edu

1Corresponding author.

ASME doi:10.1115/1.4042706 History: Received August 03, 2018; Revised January 17, 2019

Abstract

Silver is generated in the reactor core during normal operation of Very High Temperature Reactors (VHTRs). It may be transported as aerosols in the reactor circuit and plates-out at different points in the reactor including the intermitted heat exchanger (IHX). The resuspension of particles in HTRs is closely associated with source term analysis including the environment safety assessment. Adhesion force is important in determining resuspension rate used in resuspension calculations. In this work, the atomic force microscope (AFM) was used to measure the adhesive force between a spherical silver particle and VHTRs structural materials of Hastelloy X and Inconel 617. These forces were also predicted through the Johnson Kendall Roberts (JKR) theoretical model. The theoretically calculated values (when the particle size of 15.1 ┬Ám diameter was used) are higher than the measured results by a factor of a 1000. However, when surface roughness was taken into account, an improved comparison between the theoretically predicted values and the measured values was observed. In fact, the comparisons between the theoretically predicted values and the measured results show a deviation that ranges from 0.154 to 0.422 in the case of Hastelloy X and from 0.242 to 0.502 in the case of Inconel 617. The data generated provides insight into the significant influence that surface roughness has on the adhesion force. This adhesion force data may be important in understanding the adhesion of silver particles to Hastelloy X and Inconel 617, and may contribute to particle resuspension calculations.

Copyright (c) 2019 by ASME
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