Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Drop spreading dynamics with a liquid needle drop deposition technique   This paper represents a theoretical and an experimental study of the
spreading dynamics of a liquid droplet, generated by a needle free deposition
system called the liquid needle droplet deposition technique. This technique
utilizes a continuous liquid jet generated from a pressurized dosing system
which generates a liquid drop on a substrate to be characterized by optical
contact angle measurements. Although many studies have explored the theoretical
modelling of the droplet spreading scenario, a theoretical model representing
the spreading dynamics of a droplet, generated by the jet impact and continuous
addition of liquid mass, is yet to be addressed. In this study, we developed a
theoretical model based on the overall energy balance approach which enables us
to study on the physics of variation of droplet spreading under surrounding
medium of various viscosities. The numerical solution of the non-linear
ordinary differential equation has provided us the opportunity to comment on
the variation of droplet spreading, as a function of Weber number ($We$),
Reynolds number ($Re$) and Bond number ($Bo$) ranging from 0.5-3, 75-150, and
0.001-0.3, respectively. We have also presented a liquid jet impact model in
order to predict the initial droplet diameter as an initial condition for the
proposed governing equation. The model has been verified further with the
experimental measurements and reasonable agreement has been observed.
Experimental observations and theoretical investigations also highlight the
precision, repeatability and wide range of the applicability of liquid needle
drop deposition technique.

16
The categories of this paper are: stat
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn