Publication detail

Effect of Tube Pitch on Heat Transfer in Sprinkled Tube Bundle

KRACÍK, P. POSPÍŠIL, J.

Original Title

Effect of Tube Pitch on Heat Transfer in Sprinkled Tube Bundle

Type

journal article in Web of Science

Language

English

Original Abstract

Water flowing on a sprinkled tube bundle forms three basic modes: the Droplet mode (the liquid drips from one tube to another), the Jet mode (with an increasing flow rate, the droplets merge into a column) and the Membrane (Sheet) mode (with a further increase in the flow rate of the falling film liquid, the columns merge and create sheets between the tubes. With a sufficient flow rate, the sheets merge at this stage, and the tube bundle is completely covered by a thin liquid film). There are several factors influencing both the individual modes and the heat transfer. Beside the above-mentioned falling film liquid flow rate, these are for instance the tube diameters, the tube pitches in the tube bundle, or the physical conditions of the falling film liquid. This paper presents a summary of data measured at atmospheric pressure, with a tube bundle consisting of copper tubes of 12 millimetres in diameter, and with a studied tube length of one meter. The tubes are situated horizontally one above another at a pitch of 15 to 30 mm, and there is a distribution tube placed above them with water flowing through apertures of 1.0mm in diameter at a 9.2mm span. Two thermal conditions have been tested with all pitches: 15 °C to 40 °C and 15 °C to 45 °C. The temperature of the falling film liquid, which was heated during the flow through the exchanger, was 15 °C at the distribution tube input. The temperature of the heating liquid at the exchanger input, which had a constant flow rate of approx. 7.2. litres per minute, was 40 °C, or alternatively 45 °C.

Keywords

sprinkled; tube bundle; heat transfer; tube pitch

Authors

KRACÍK, P.; POSPÍŠIL, J.

RIV year

2015

Released

31. 10. 2015

Publisher

Czech Technical University in Prague

Location

Praha

ISBN

1210-2709

Periodical

Acta Polytechnica

Year of study

55

Number

5

State

Czech Republic

Pages from

329

Pages to

334

Pages count

6

URL

https://ojs.cvut.cz/ojs/index.php/ap/article/view/2459

Full text in the Digital Library

http://hdl.handle.net/11012/201061

BibTex

@article{BUT117920,
  author="Petr {Kracík} and Jiří {Pospíšil}",
  title="Effect of Tube Pitch on Heat Transfer in Sprinkled Tube Bundle",
  journal="Acta Polytechnica",
  year="2015",
  volume="55",
  number="5",
  pages="329--334",
  doi="10.14311/AP.2015.55.0329",
  issn="1210-2709",
  url="https://ojs.cvut.cz/ojs/index.php/ap/article/view/2459"
}