Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Analysis of chaotic flow in a 2D multi-turn closed-loop pulsating heat
  pipe   Numerical study has been conducted for the chaotic flow in a multi-turn
closed-loop pulsating heat pipe (PHP). Heat flux and constant temperature
boundary conditions have been applied for heating and cooling sections
respectively. Water was used as working fluid. Volume of Fluid (VOF) method has
been employed for two-phase flow simulation. Volume fraction results showed
formation of perfect vapor and liquid plugs in the fluid flow of PHP.
Non-linear time series analysis, power spectrum density, correlation dimension
and autocorrelation function were used to investigate the chaos. Absence of
dominating peaks in the power spectrum density was a signature of chaos in the
pulsating heat pipe. It was found that by increasing the filling ratio and
evaporator heating power the correlation dimension increases. Decreasing of the
autocorrelation function with respect to time showed the prediction ability is
finite as a result of chaotic state. An optimal filling ratio of 60% and
minimum thermal resistance of 1.62 K/W were found for better thermal
performance of the pulsating heat pipe.

27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex