An experimental study of laminar film condensation with Stefan number greater than unity

Journal Article · Wed May 01 00:00:00 EDT 1991 · Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States)

DOI:https://doi.org/10.1115/1.2910585· OSTI ID:5274077

Mahajan, R L; Dickinson, D A ^[1]; Chu, T Y ^[2]

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1. AT and T-Bell Lab., Princeton, NJ (USA)
2. Sandia Lab., Albuquerque, NM (USA)

Experimental laminar condensation heat transfer data are reported for fluids with Stefan number up to 3.5. The fluid is a member of a family of fluorinated fluids, which have been used extensively in the electronics industry for soldering, cooling, and testing applications. Experiments were performed by suddenly immersing cold copper spheres in the saturated vapor of this fluid, and heat transfer rates were calculated using the quasi-steady temperature response of the spheres. In these experiments, the difference between saturation and wall temperature varied from 0.5C to 190C. Over this range of temperature difference, the condensate properties vary significantly; viscosity of the condensate varies by a factor of nearly 50. Corrections for the temperature-dependent properties of the condensate therefore were incorporated in calculating the Nusselt number based on the average heat transfer coefficient. The results are discussed in light of past experimental data and theory for Stefan number less than unity. To the knowledge of the authors, this is the first reported study of condensation heat transfer examining the effects of Stefan number greater than unity.

• OSTI ID: 5274077
• Journal Information: Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States), Journal Name: Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States) Vol. 113:2; ISSN 0022-1481; ISSN JHTRA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
BENCH-SCALE EXPERIMENTS
COPPER
ELEMENTS
ENERGY TRANSFER
FILM CONDENSATION
FLUID FLOW
HALOGENATED ALIPHATIC HYDROCARBONS
HEAT TRANSFER
LAMINAR FLOW
METALS
NUSSELT NUMBER
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
SPHERES
TRANSITION ELEMENTS
VAPOR CONDENSATION