Performance characteristics of pulsating heat pipe with various non-uniform heating conditions

Wonhee Cho, Dong Soo Jang, Junyub Lim, Kyeongsoo Song, Yong Chan Kim

Research output: Contribution to journalConference article

Abstract

This paper presents heat transfer characteristics of a pulsating heat pipe under various non-uniform heating conditions. The evaporator section of the pulsating heat pipe is subjected to two individual heat sources, which can supply separate heat inputs. Non-uniformity in heat inputs is represented by the newly defined asymmetric heating ratio, which ranged from 0 to 0.2. The pulsating heat pipe utilizes HFE-7100 as the working fluid, and the filling ratio was fixed to 60%. The influence of asymmetric heating ratio on the thermal performance are analyzed with the measured pressure, the temperature difference between two parts of the evaporator section, and the thermal resistance at various heat inputs. The fluctuating frequencies of the measured pressure were examined to identify the type of internal flow motion. The results show that unbalanced heat input increases the driving force towards flow circulation, which lowers the thermal resistance and levels out the change in evaporator temperature difference, but leads to the early appearance of dry-out.

Original languageEnglish
Pages (from-to)4789-4794
Number of pages6
JournalInternational Heat Transfer Conference
Volume2018-August
Publication statusPublished - 2018 Jan 1
Event16th International Heat Transfer Conference, IHTC 2018 - Beijing, China
Duration: 2018 Aug 102018 Aug 15

Fingerprint

heat pipes
Heat pipes
evaporators
Heating
heat
heating
Evaporators
thermal resistance
temperature gradients
Heat resistance
internal flow
working fluids
heat sources
nonuniformity
heat transfer
Hot Temperature
Heat transfer
Temperature
Fluids

Keywords

  • Heat pipe
  • Heat transfer enhancement
  • Non-uniform heating conditions
  • Two-phase flow

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Performance characteristics of pulsating heat pipe with various non-uniform heating conditions. / Cho, Wonhee; Jang, Dong Soo; Lim, Junyub; Song, Kyeongsoo; Kim, Yong Chan.

In: International Heat Transfer Conference, Vol. 2018-August, 01.01.2018, p. 4789-4794.

Research output: Contribution to journalConference article

Cho, Wonhee ; Jang, Dong Soo ; Lim, Junyub ; Song, Kyeongsoo ; Kim, Yong Chan. / Performance characteristics of pulsating heat pipe with various non-uniform heating conditions. In: International Heat Transfer Conference. 2018 ; Vol. 2018-August. pp. 4789-4794.
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N2 - This paper presents heat transfer characteristics of a pulsating heat pipe under various non-uniform heating conditions. The evaporator section of the pulsating heat pipe is subjected to two individual heat sources, which can supply separate heat inputs. Non-uniformity in heat inputs is represented by the newly defined asymmetric heating ratio, which ranged from 0 to 0.2. The pulsating heat pipe utilizes HFE-7100 as the working fluid, and the filling ratio was fixed to 60%. The influence of asymmetric heating ratio on the thermal performance are analyzed with the measured pressure, the temperature difference between two parts of the evaporator section, and the thermal resistance at various heat inputs. The fluctuating frequencies of the measured pressure were examined to identify the type of internal flow motion. The results show that unbalanced heat input increases the driving force towards flow circulation, which lowers the thermal resistance and levels out the change in evaporator temperature difference, but leads to the early appearance of dry-out.

AB - This paper presents heat transfer characteristics of a pulsating heat pipe under various non-uniform heating conditions. The evaporator section of the pulsating heat pipe is subjected to two individual heat sources, which can supply separate heat inputs. Non-uniformity in heat inputs is represented by the newly defined asymmetric heating ratio, which ranged from 0 to 0.2. The pulsating heat pipe utilizes HFE-7100 as the working fluid, and the filling ratio was fixed to 60%. The influence of asymmetric heating ratio on the thermal performance are analyzed with the measured pressure, the temperature difference between two parts of the evaporator section, and the thermal resistance at various heat inputs. The fluctuating frequencies of the measured pressure were examined to identify the type of internal flow motion. The results show that unbalanced heat input increases the driving force towards flow circulation, which lowers the thermal resistance and levels out the change in evaporator temperature difference, but leads to the early appearance of dry-out.

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