Enhanced pool boiling heat transfer with surface attachment

Journal Article · Tue Dec 31 23:00:00 EST 1991 · Experimental Heat Transfer; (United States)

DOI:https://doi.org/10.1080/08916159208946432· OSTI ID:5096798

Chyu, M C; Mghamis, A M ^[1]

---

1. Dept. of Mechanical Engineering, Texas Technical Univ., Lubbock, TX (US)

This paper reports on a pool boiling experiment with either water or Freon-113 that was conducted to investigate nucleate boiling from a heated wall with either a spherical or a cylindrical attachment. The result revealed that nucleate boiling can be enhanced by applying a horizontal cylindrical attachment to a vertical heated wall, owing to the favorable thermal environment characterized by a small-gradient liquid temperature profile within the restricted regions between the attachment and the heated wall. Nucleate boiling is enhanced in terms of a lower wall superheat required for incipient boiling and more bubbles generated than from an open heated wall. As a result of the enhanced nucleate boiling, heat transfer of the vertical heated wall above the attachment was improved due to excessive bubbles moving upward along the heated wall, causing removal of the thermal layer near the wall and evaporation of the thin liquid film between the bubbles and the wall. The boiling curve hysteresis with Freon-113 was significantly reduced as a result. The effects of diameter, length, and surface roughness of the cylindrical attachment were also investigated.

• OSTI ID: 5096798
• Journal Information: Experimental Heat Transfer; (United States), Journal Name: Experimental Heat Transfer; (United States) Vol. 5:1; ISSN 0891-6152; ISSN EXHTE
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
661300 -- Other Aspects of Physical Science-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BOILING
BUBBLES
DATA
DESIGN
ENERGY TRANSFER
ENTHALPY
EVAPORATION
EXPERIMENTAL DATA
FREONS
HALOGENATED ALIPHATIC HYDROCARBONS
HEAT TRANSFER
HEATING
HYDROGEN COMPOUNDS
INFORMATION
NUCLEATE BOILING
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
POOL BOILING
SUPERHEATING
SURFACE PROPERTIES
TEMPERATURE GRADIENTS
THERMODYNAMIC PROPERTIES
TRANSITION HEAT
TUBES
WALLS
WATER