Nucleate pool boiling from a horizontal wire in viscoelastic fluids
The nucleate pool boiling behavior of viscoelastic aqueous polymer solutions has been studied experimentally and compared with results for pure water. The polymers used in this study were a polyacrylamide (Separan AP-30) and a hydroxyethyl cellulose (Natrosol 250HHR). The conventional q{double prime} vs {Delta}T boiling curves were measured using an electrically heated horizontal platinum wire of diameter 0.0254 cm submerged in a saturated pool of liquid at atmospheric pressure. The steady shear viscosity of each polymer solution was measured carefully over the shear rate range of 10{sup {minus}1} to 10{sup 5} sec{sup {minus}1} both before and after boiling to ensure that the rheological properties were stable during the boiling process. It was found that the water boiling data are in good agreement with Kutateladze's correlation, with Rohsenow's earlier correlation proposed in 1952 and in fair agreement with Nishikawa's correlation. All of the Separan solutions, over the experimental heat flux range of 2.2 to 55 W/cm{sup 2}, demonstrated a heat transfer reduction as compared to the water performance. In the case of the Natrosol solutions, the lowest concentration of 500 wppm gave results which were about the same as found for water. However, at concentrations of 1,500 wppm and above, dramatically different behavior was observed. At lower heat flux values the magnitude of AT increased as q{double prime} increased, as anticipated. However, at approximately 13 W/cm{sup 2} a maximum {delta}T was reached and as q{double prime} was increased above 13 W/cm{sup 2} the value of {Delta}T decreased. A series of photographic studies taken with a regular home video camera and a high speed video camera provided additional insight into the boiling process for all the solutions.
- Research Organization:
- Illinois Univ., Chicago, IL (USA)
- OSTI ID:
- 5885324
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ACRYLAMIDE
NUCLEATE BOILING
POOL BOILING
CELLULOSE
ATMOSPHERIC PRESSURE
COMPARATIVE EVALUATIONS
ELECTRIC HEATING
FLOW VISUALIZATION
HEAT FLUX
HEAT TRANSFER
PHOTOGRAPHY
PLATINUM
POLYMERS
QUANTITY RATIO
RHEOLOGY
WATER
AMIDES
BOILING
CARBOHYDRATES
ELEMENTS
ENERGY TRANSFER
HEATING
HYDROGEN COMPOUNDS
METALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PLATINUM METALS
POLYSACCHARIDES
SACCHARIDES
TRANSITION ELEMENTS
420400* - Engineering- Heat Transfer & Fluid Flow