Measurements of Local Mass Transfer Coefficients and Pressure Distribution Along the Shell-Side of Oval-Shaped Tubes in Cross Flow Heat Exchangers

Merker, Günter P.; Hanke, Horst

doi:10.1615/ihtc8.1160

Cited by 3 publications

(3 citation statements)

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“…2b, consists of 19 planes of 53 760 cells each (1021 440 cells in total). The time step for both meshes was equal to 1 £ 10 ¡4 s and statistics were recorded for 2 12 time steps, which corresponds to around 27:2 £ 2a=U b :…”

Section: Numerical Methodologymentioning

confidence: 99%

“…Studies of the¯ow and heat transfer distribution in two elliptic cylinders with an axis ratio of 1 : 2 in tandem arrangement showed that the local heat transfer coe cients depended strongly upon the angle of attack and the cylinder spacing both for the upstream and the downstream cylinder [10]. Measurements of the mass transfer and the pressure drop in oval-shaped staggered tube bundles of various pitch ratios [11,12] have shown that oval-shaped cylinders are advantageous when the available pumping power is restricted. However, an in-line array with elliptic tubes with an axis ratio of 1 : 2 was found to have both lower heat transfer coe cients and pressure drop than the corresponding tube bundles with circular tubes [13].…”

Section: Introductionmentioning

confidence: 99%

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An experimental and numerical study of the flow past elliptic cylinder arrays

Castiglia

Balabani

Papadakis

et al. 2001

Proceedings of the Institution of Mechanical Engineers, Part C:

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The subcritical flow over an array of elliptic cylinders with an axis ratio of 1:2 was studied both experimentally and numerically. The mean velocities, turbulence levels and the vortex dynamics of the array were determined experimentally by flow visualization and using a laser Doppler anemometer (LDA) and the flow was modelled using three-dimensional large eddy simulation (LES). The experimental results were compared with results obtained previously using circular cylinders and with numerical predictions of the flow. The study indicated that the flow past such a widely spaced array is characterized by low turbulence levels and poor lateral mixing compared with conventional circular cylinder arrays, and a weak flow periodicity with a constant Strouhal number of 0.11 was detected in downstream rows. The predicted mean and r.m.s. velocities, as well as the flow periodicity, were in good agreement with the experimental results.

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Section: Numerical Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An experimental and numerical study of the flow past elliptic cylinder arrays

Castiglia

Balabani

Papadakis

et al. 2001

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…In departing from conventional circular tubes it was found that oval tubes (sometimes referred to as profile tubes) offered attractive heat transfer characteristics and low-pressure losses in the laminar flow regime (Merker and Hanke, 1986). An excellent example of a module fabricated from this type of tubular geometry is shown on Figure 16.…”

Section: Oval Tube Geometriesmentioning

confidence: 99%

Recuperated gas turbine aeroengines, part II: engine design studies following early development testing

McDonald

Massardo

Rodgers³

et al. 2008

Aircraft Engineering and Aerospace Technology

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Purpose -To advance the design of heat exchanged gas turbine propulsion aeroengines utilising experience gained from early development testing, and based on technologies prevailing in the 1970-2000 time frame. Design/methodology/approach -With emphasis on recuperated helicopter turboshaft engines, particularly in the 1,000 hp (746 kW) class, detailed performance analyses, parametric trade-off studies, and overall power plant layouts, based on state-of-the-art turbomachinery component efficiencies and high-temperature heat exchanger technologies, were undertaken for several engine configuration concepts. Findings -Using optimised cycle parameters, and the selection of a light weight tubular heat exchanger concept, an attractive engine architecture was established in which the recuperator was fully integrated with the engine structure. This resulted in a reduced overall engine weight and lower specific fuel consumption, and represented a significant advancement in technology from the modified simple-cycle engines tested in the late 1960s. Practical implications -While heat exchanged engine technology advancements were projected, there were essentially two major factors that essentially negated the continued study and development of recuperated aeroengines, namely again as mentioned in Part I, the reduced fuel consumption was not regarded as an important economic factor in an era of low-fuel cost, and more importantly in this time frame very significant simple-cycle engine performance advancements were made with the use of significantly higher pressure ratios and increased turbine inlet temperatures. Simply stated, recuperated variants could not compete with such a rapidly moving target. Originality/value -Establishing an engine design concept in which the recuperator was an integral part of the engine structure to minimise the overall power plant weight was regarded as a technical achievement. Such an approach, together with the emergence of lighter weight recuperators of assured structural integrity, would find acceptance around the year 2000 when there was renewed interest in the use of more efficient heat exchanged variants towards the future goal of establishing "greener" aeroengines, and this is discussed in Part III of this paper.

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Compact Energy Recovery Units for Vehicular Gas Turbines

Pellischek¹,

Reile²

1992

SAE Technical Paper Series

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Measurements of Local Mass Transfer Coefficients and Pressure Distribution Along the Shell-Side of Oval-Shaped Tubes in Cross Flow Heat Exchangers

Cited by 3 publications

References 0 publications

An experimental and numerical study of the flow past elliptic cylinder arrays

An experimental and numerical study of the flow past elliptic cylinder arrays

Recuperated gas turbine aeroengines, part II: engine design studies following early development testing

Compact Energy Recovery Units for Vehicular Gas Turbines

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