Begell House Inc.
Journal of Enhanced Heat Transfer
JEH(T)
1065-5131
21
2-3
2014
PREFACE: COMMEMORATING THE LIFE AND TIMES OF ART BERGLES (1935 − 2014): HE PEDALED FAR AND WIDE, MADE A DIFFERENCE ... AND THE TRAIL IS AN ENRICHING LEGACY
iv-vii
10.1615/JEnhHeatTransf.2015015286
Raj M.
Manglik
Thermal-Fluids and Thermal Processing Laboratory, Mechanical and Materials Engineering, University of Cincinnati, 2600 Clifton Ave, Cincinnati, OH 45220, USA
Preface
THE IMPERATIVE OF HEAT TRANSFER ENHANCEMENT WHEREVER THERE IS A TEMPERATURE DIFFERENCE: THE LIFE AND LEGACY OF PROFESSOR ARTHUR E. BERGLES
89-110
10.1615/JEnhHeatTransf.2015014787
Raj M.
Manglik
Thermal-Fluids and Thermal Processing Laboratory, Mechanical and Materials Engineering, University of Cincinnati, 2600 Clifton Ave, Cincinnati, OH 45220, USA
enhanced heat and mass transfer
passive techniques
active techniques
compound techniques
biography
literature survey
The heightened significance of enhanced heat transfer, and the application of the different techniques
that have been devised to achieve augmented performance, is perhaps unequivocally underscored by
the crisis reflected in the current energy-water nexus debate. The need for energy and water conservation
urgently requires integration of high-performance heat exchangers across the entire spectrum of
engineering applications: from large-scale exchangers in the power and process industry to microscale
devices in microelectronics and biomedical systems. Professor Arthur E. Bergles, or Art, as he was
affectionately known to his multitude of friends worldwide, was a pioneer of this field and perhaps its
most passionate advocate. Art's passing on March 17, 2014 has left an irreplaceable void. His very
large body of trailblazing contributions to heat transfer and its enhancement epitomizes, in many different
ways, his life and times. Art's life (1935-2014) and professional journey are celebrated in this
essay because they are not only inspirational but also instructive in suggesting possible energy-water
conservation pathways in the times to come.
HEAT TRANSFER ENHANCEMENT FOR TURBINE BLADE INTERNAL COOLING
111-140
10.1615/JEnhHeatTransf.2015012169
Lesley M.
Wright
Baylor University, Department of Mechanical Engineering, Waco, Texas 76798-7356, USA
Je-Chin
Han
Turbine Heat Transfer Laboratory, Department of Mechanical Engineering, Texas A&M University College Sation, TX 77843-3123, USA
single-phase convection
rough surfaces
swirl-flow devices
jet impingement
compound enhancement techniques
Gas turbines are used extensively for aircraft propulsion, land-based power generation, and industrial
applications. The turbine inlet temperatures are far above the permissible metal temperatures. Therefore,
there is a need to cool the blades for safe operation. Modern developments in turbine cooling
technology play a critical role in increasing the thermal efficiency and power output of advanced gas
turbine designs. Turbine blades and vanes are cooled internally and externally. This paper focuses on
heat transfer augmentation of turbine blade internal cooling. Internal cooling is typically achieved
by passing the cooling air through rib-enhanced serpentine passages inside the blades. Impinging
jets, pin-fins, and dimples are also used for enhancing internal cooling heat transfer. In the past 10
years, there has been considerable progress in turbine blade internal cooling research and this paper
is focused on reviewing selected publications to reflect recent developments in this area. In particular,
this paper focuses on the newly developed design concepts as well as the combination of existing
cooling techniques for turbine airfoil internal heat transfer augmentation. Rotation effects on the turbine
blade leading-edge, triangular-shaped channel, mid-chord multi-pass channel, and trailing-edge,
wedge-shaped channel with coolant ejection are also considered.
FORCE FIELDS EFFECTS ON POOL BOILING HEAT TRANSFER
141-182
10.1615/JEnhHeatTransf.2015012440
Walter
Grassi
Lo.Th.A.R. (Low gravity and Thermal Advanced Research Laboratory), DESTEC (Department of Energy, Systems, Territory and Constructions Engineering), University of Pisa−Largo Lucio Lazzarino, 56122 Pisa, Italy
Daniele
Testi
University of Pisa
active enhancement techniques
electric fields
EHD
heat transfer
enhancement
nucleate boiling
film boiling
CHF
ion injection
This paper summarizes more than 20 years of research aimed at studying the effects of electrical
and gravitational force fields on boiling heat transfer. Results obtained on several microgravity
platforms are presented and the role played by the electric field is described herein. The regimes
of nucleate boiling and film boiling, together with the parameters controlling the liquid-vapor
interface instability and its effect on the critical heat flux, are outlined with regard to pool boiling.
In addition, the promising technique of ion injection for efficient heat transfer enhancement by
generation of liquid jets is described, together with the experimental results obtained in pool
boiling and with some attempts of theoretical interpretations. The following dielectrics were
employed: R113, Vertrel XF, FC-72, and HFE-7100.
HEAT TRANSFER AND HYDRAULIC RESISTANCE OF FORCED CONVECTION IN TUBES WITH TWISTED-TAPE INSERTS AND DIFFERENT INLET CONDITIONS
183-194
10.1615/JEnhHeatTransf.2015012139
Anatoly B.
Yakovlev
Kazan National Research Technical University named after A. N. Tupolev−KAI, 10 Karl Marx str., Kazan 420111, Russia
Stanislav E.
Tarasevich
Federal State Government-Funded Educational Institution of Higher Professional Education "Kazan National Research Technical University
named after A. N. Tupolev" (KAI), 10 Karl Marx Str., Kazan, Republic of Tatarstan, 420111, Russia
swirl-flow devices
single-phase flow
two-phase flow
passive enhancement
short channel
surface boiling
Results of an experimental study of heat transfer and hydraulic resistance for the flow of water in tubes with straight and twisted-tape inserts, with axial and radial fluid-flow inlets to the tube, are presented. The transition-to-turbulent-flow regime experimental data are analyzed to show the generalized dependencies of convection on variables that describe the flow geometry and thermal-hydraulic conditions. Based on this parametric analysis, predictive equations are developed for calculation of heat transfer at the initial section of the tube with twisted-tape insert with both axial and radial fluid inlet.
TWO-PHASE FLOW REGIMES AND EVAPORATIVE HEAT TRANSFER IN INTERNALLY-GROOVED TUBES
195-230
10.1615/JEnhHeatTransf.2015012286
Darin J.
Sharar
General Technical Services, LLC, Wall, New Jersey, USA
Avram
Bar-Cohen
Laboratory of the Thermal Management of Electronics, Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455, USA; Defense Advanced Research Projects Agency (DARPA), Microsystems Technology Office, University of Maryland, College Park, MD, USA
two-phase flow
extended surfaces
micro-finned tube
micro-grooved tube
refrigerant evaporators
The limited accuracy and parametric range of two-phase heat transfer correlations for internally-grooved tubes have impeded the widespread application of this most promising technology. The success of regime-based analyses and correlations in providing improved predictive accuracy for heat transfer coefficients in smooth tubes has motivated this effort to explore the relationship between two-phase flow regimes and heat transfer rates in internally-grooved tubes. Following
a brief introduction to the geometries and manufacturing techniques of internally-grooved tubes and a description of the state-of-the-art smooth tube flow regime maps, fundamental studies of thermofluid performance in internally-grooved tubes are reviewed and analyzed to demonstrate the relationship between flow regime and evaporative heat transfer rates. Then, the current state of two-phase flow regime maps and heat transfer coefficient correlations for internally-grooved
tubes are summarized. Finally, recommendations for future internally-grooved tube research directions are given. The majority of the studies herein deal with halogenated fluids
in conventional-sized tubes at standard temperature and pressure. However, studies of small diameter tubes, as well as alternative refrigerants and reduced pressure, are also considered.
AN EXPERIMENTAL ANALYSIS OF HEAT TRANSFER CAPABILITY OF NANOFLUIDS IN SINGLE-PHASE TUBULAR FLOWS
231-258
10.1615/JEnhHeatTransf.2015012323
R.
Bubbico
Department of Chemical Engineering, Materials and Environment, "Sapienza" University, Rome, Italy
Gian Piero
Celata
ENEA, Institute of Thermal Fluid Dynamics, ENEA TERM/ISP Heat Transfer Laboratory C.R.E.
Francesco
D'Annibale
Laboratory of Thermal Fluid-Dynamics Applied to Energy Systems, ENEA, Rome, Italy
B.
Mazzarotta
Department of Chemical Engineering, Materials and Environment, "Sapienza" University, Rome, Italy
C.
Menale
Department of Chemical Engineering, Materials and Environment, "Sapienza" University, Rome, Italy
nanofluid
heat transfer
forced convection
single-phase flow
additives for liquids
passive enhancement
In the present paper the results of an experimental investigation on the advantages of using nanofluids for heat transfer operations have been reported. The nanofluid systems varied both in terms of type of particles and their concentration, and of base fluid, for a total of 23 different
system configurations. The experimentally derived heat transfer coefficients for these systems, for single-phase forced convection inside tubes, have been compared with those of water or of the corresponding base fluid. The trends identified have been reported as a function of different operating parameters (Re number and fluid average velocity) and the analysis showed that the advantage often claimed for nanofluids actually occurs only under a limited number of hydrodynamic conditions and at the expense of a much higher pumping energy. At the same time, the most commonly adopted correlations for the prediction of the heat transfer coefficient of homogeneous mixtures have been applied to the investigated systems, to check whether it is possible to predict the heat transfer capability of a nanofluid with the ordinary equations by simply introducing the average physical properties of the mixture. It has been found that with the exception of Al2O3 suspensions, in most of the cases the heat transfer coefficient can be actually predicted with a rather good level of accuracy.