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2 results on '"Megerlin, F. E."'

1. Augmentation of Heat Transfer in Tubes by Use of Mesh and Brush Inserts

Author

Megerlin, F. E., Murphy, R. W., and Bergles, A. E.

Abstract

This paper summarizes the results of a study to determine the heat transfer and pressure drop characteristics of two types of tube inserts developed specifically for augmenting heat transfer and accommodating high heat fluxes. The best performing mesh-insert tubes exhibited heat transfer coefficients nine times the coefficients with empty tubes while brush-insert tubes had coefficients averaging five times the empty tube values, both comparisons being made at equal mass velocity. Both inserts produced very large pressure drops. Subcooled boiling curves and burnout points are presented; burnout heat fluxes are two to three times the empty tube values at equal mass velocity. For single-phase conditions and for burnout, the mesh and brush tubes have favorable performance characteristics, based on pumping power, which suggest use of these inserts in certain special cooling systems.

Published
1974
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2. The Experimental Determination of the Thermodynamic and Hydrodynamic Mechanism of Augmented Flow Boiling in Tubes.

Author

RAYTHEON CO BEDFORD MA MISSILE SYSTEMS DIV, Megerlin, F. E., RAYTHEON CO BEDFORD MA MISSILE SYSTEMS DIV, and Megerlin, F. E.

Abstract

Experimental results are presented for a new and unique heat transfer augmentation technique in tubes. The technique consists of inserting a porous mesh structure into the flow passage of the tube. Due to the increased degree of turbulence, both the single phase heat transfer coefficient and the two-phase subcooled boiling heat transfer rate are considerably increased over the values achievable in empty tubes at similar flow conditions. In particular, the burnout heat flux achievable with mesh-filled tubes is twice the value that can be achieved with empty tubes at the same mass flow rates. The experimental data concerns single phase heat transfer, flow boiling burnout, and pressure drop. The technique should be of interest in the cooling of reactors, high power electronic tubes and rocket nozzles, or in other situations where extremely high heat fluxes must be dissipated. (Author)

Published
1970

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