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\begin{document}

\title{NUMERICAL INVESTIGATION OF CONVECTIVE HEAT TRANSFER PERFORMANCE IN
CORRUGATED CONVERGING PIPE}



\author[1]{Olatomide G. Fadodun}%
\author[2]{Adenike Olatinwo}%
\author[1]{Adebimpe A. Amosun}%
\author[3]{Adefope Adeyanju}%
\author[2]{T. Ojo Micheal}%
\affil[1]{Obafemi Awolowo University Centre for Energy Research and Development}%
\affil[2]{Obafemi Awolowo University College of Health Sciences}%
\affil[3]{Lead City University Faculty of Education}%


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  \date{May 18, 2024}


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\begin{abstract}
This study examines turbulent convective heat transfer performance
(CHTP) and entropy production rate (EPR) of distilled water flowing in
outwardly corrugated converging pipes (CCPs) of various diameter ratios
(DR). The SST k - \selectlanguage{greek}ω \selectlanguage{english}turbulence models were used to simulate the flow of
H \textsubscript{2}O inside the pipe. The effects of Reynolds number ( 5
. 0 \selectlanguage{ngerman}× 10 3 \selectlanguage{english}[?] Re~ \selectlanguage{english}[?] 5 . 0 x 10 4 ), and DR ( 1 \selectlanguage{english}[?] DR~ \selectlanguage{english}[?] 2 ) on average
Nusselt number ( Nu ), Poiseuille number (fRe) thermal performance
evaluation criterion (PEC), EPR, and thermal effectiveness number ( I )
Nu were investigated parametrically. The findings revealed a significant
improvement in Nu in the modified pipe compared with the straight pipe.
This improvement is attributed to flow acceleration and increases in the
mixing rate of hot fluid near the wall with cold fluid at the core fluid
zone. Also, Nu , fRe , and EPR increase with increasing Re and DR.
However, the opposite is the case for PEC and ~ I . Finally, the values
of PEC, and I revealed that the modified pipe is advantageous compared
with a straight pipe at ( 5 x 10 3 \selectlanguage{english}[?] Re \selectlanguage{english}[?] 1 . 0 x 10 4 ) .%
\end{abstract}\selectlanguage{ngerman}%



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