The grain-bed impact process in aeolian saltation

1986 ◽  
Vol 63 (1-4) ◽  
pp. 267-278 ◽  
Author(s):  
S. Mitha ◽  
M. Q. Tran ◽  
B. T. Werner ◽  
P. K. Haff
Keyword(s):  
Impact Process ◽  
Aeolian Saltation

A Study on Evolution of Splat Radius and Temperature in Thermal Spray Process

2018 ◽  
Author(s):  
Manpreet Dash ◽  
Sangharsh Kumar ◽  
Partha Pratim Bandyopadhyay ◽  
Anandaroop Bhattacharya
Keyword(s):  
Heat Transfer ◽  
Thermal Spray ◽  
Molten Metal ◽  
Spray Deposition ◽  
Substrate Surface ◽  
Metal Droplet ◽  
Droplet Impingement ◽  
Impact Process ◽  
The Impact ◽  
Maximum Spreading

The impact process of a molten metal droplet impinging on a solid substrate surface is encountered in several technological applications such as ink-jet printing, spray cooling, coating processes, spray deposition of metal alloys, thermal spray coatings, manufacturing processes and fabrication and in industrial applications concerning thermal spray processes. Deposition of a molten material or metal in form of a droplet on a substrate surface by propelling it towards it forms the core of the spraying process. During the impact process, the molten metal droplet spreads radially and simultaneously starts losing heat due to heat transfer to the substrate surface. The associated heat transfer influences impingement behavior. The physics of droplet impingement is not only related to the fluid dynamics, but also to the respective interfacial properties of solid and liquid. For most applications, maximum spreading diameter of the splat is considered to be an important factor for droplet impingement on solid surfaces. In the present study, we have developed a model for droplet impingement based on energy conservation principle to predict the maximum spreading radius and the radius as a function of time. Further, we have used the radius as a function of time in the heat transfer equations and to study the evolution of splat-temperature and predict the spreading factor and the spreading time and mathematically correlate them to the spraying parameters and material properties.

scholarly journals A Combined Impact-Process Evaluation of a Program Promoting Active Transport to School: Understanding the Factors That Shaped Program Effectiveness

2013 ◽  
Vol 2013 ◽  
pp. 1-14 ◽  
Author(s):  
S. Crawford ◽  
J. Garrard
Keyword(s):  
Mixed Methods ◽  
Process Evaluation ◽  
Active Transport ◽  
Primary Schools ◽  
Quantitative Data ◽  
Program Effectiveness ◽  
Primary School Children ◽  
Second Phase ◽  
Program Staff ◽  
Impact Process

This mixed methods study was a comprehensive impact-process evaluation of the Ride2School program in metropolitan and regional areas in Victoria, Australia. The program aimed to promote transport to school for primary school children. Qualitative and quantitative data were collected at baseline and followup from two primary schools involved in the pilot phase of the program and two matched comparison schools, and a further 13 primary schools that participated in the implementation phase of the program. Classroom surveys, structured and unstructured observations, and interviews with Ride2School program staff were used to evaluate the pilot program. For the 13 schools in the second phase of the program, parents and students completed questionnaires at baseline (N= 889) and followup (N= 761). Based on the quantitative data, there was little evidence of an overall increase in active transport to school across participating schools, although impacts varied among individual schools. Qualitative data in the form of observations, interviews, and focus group discussions with students, school staff, and program staff provided insight into the reasons for variable program impacts. This paper highlights the benefits of undertaking a mixed methods approach to evaluating active transport to school programs that enables both measurement and understanding of program impacts.

scholarly journals Atmospheric stability and diurnal patterns of aeolian saltation on the Llano Estacado

2016 ◽  
Vol 21 ◽  
pp. 131-137 ◽  
Author(s):  
David Lanigan ◽  
John Stout ◽  
William Anderson
Keyword(s):  
Atmospheric Stability ◽  
Diurnal Patterns ◽  
Aeolian Saltation

Intermittency of aeolian saltation

2014 ◽  
Vol 37 (12) ◽  
Author(s):  
Zhen-Ting Wang ◽  
Chun-Lai Zhang ◽  
Hong-Tao Wang
Keyword(s):  
Aeolian Saltation

Collisions in aeolian saltation

1986 ◽  
Vol 63 (1-4) ◽  
pp. 255-265 ◽  
Author(s):  
B. B. Willetts ◽  
M. A. Rice
Keyword(s):  
Aeolian Saltation
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