Temperature Profile Development in Turbulent Mixing of Coolant Jets With a Confined Hot Crossflow

Wittig, Sigmar; Elbahar, O. M. F.; Noll, Berthold

doi:10.1115/1.3239534

Cited by 27 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, in addition to the Reynolds number of the cross flow, Reg, the momentum flux ratio of the jet to the cross flow , J, occurs as a second scale factor, which determines the length and the height of the separation bubble. The velocity and temperature distributions in such flow fields have been examined by our group (Wittig et al, 1984) and by several other authors (Kamotani andGreber, 1974, Mikhail et al, 1975), although very little documentation exists concerning the heat transfer distribution downstream of injection. Publications involving film cooling configurations are limited predominately to low values of the momentum flux ratio (J<1) to prevent flow separation.…”

mentioning

confidence: 99%

The Influence of the Recirculation Region: A Comparison of the Convective Heat Transfer Downstream of a Backward-Facing Step and Behind a Jet in a Cross Flow

Scherer¹,

Wittig²

1989

Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation;

View full text Add to dashboard Cite

Convective heat transfer is examined in two typical examples of separated flows, namely: the flow over a backward-facing step and a two-dimensional jet entering a cross flow. Local Nusselt numbers were determined in and behind the recirculation region. The main parameters influencing the heat transfer, the Reynolds number and the momentum flux ratio of the jet and the cross flow, have been varied in a wide range. In addition to heat transfer measurements, the flow field has been documented using a LDA-system and oil film techniques. The static pressure distribution at the wall within the separated flow is also given. The measurements are compared with the results of a numerical code, based on a finite volume method, where the well known k-ε-model is employed. The differences in Nusselt numbers predicted with a one- and a two-layer model are shown to demonstrate the influence of wall functions on heat transfer. The numerical and experimental results are compared with available data, and the differences and similarities in the heat transfer behaviour of separated flows are discussed.

show abstract

mentioning

confidence: 99%

The Influence of the Recirculation Region: A Comparison of the Convective Heat Transfer Downstream of a Backward-Facing Step and Behind a Jet in a Cross Flow

Scherer¹,

Wittig²

1989

Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation;

View full text Add to dashboard Cite

show abstract

“…The experimental setup for this flow configuration is illustrated in Fig. 12 and experimental results have been published by Wittig et al (1984) and Noll (1986). Two opposite rows of air jets are penetrating the main flow with velocities of 75.6 at the top row and 75.0 the bottom row.…”

Section: Three-dimensional Jet-mixing Flowmentioning

confidence: 99%

Numerical Simulation of Combustor Flows on Parallel Computers: Practical Limitations and Practical Experience

Kurreck

Wittig

1994

Volume 3: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations

View full text Add to dashboard Cite

A parallelized finite-volume algorithm for the prediction of two- and three-dimensional turbulent flow problems is presented. For the parallelization, the domain decomposition method is applied. Three different procedures for coupling the subdomains and two iterative methods for solving the system of algebraic equations are outlined. As typical applications, the two-dimensional flow in a model combustor, the three-dimensional flow in an experimental combustor and a jet-mixing flow are predicted using the parallel algorithms on two different parallel computing systems (Parsytec GCel, SUN-workstation cluster). A workstation cluster is suitable for a small number of processors (1–16) only. In contrast to this, a transputer cluster of 448 processors can be used efficiently. The comparision of the CPU-times of the parallel and the vectorized version of the CFD code, running on a SNI S600/20 vector computer, shows, that current technology vector processors give the best performance. Since the performance of the individual parallel processor can be increased without difficulty, parallel processing has the potential to solve large problems which cannot be solved by current vector computers.

show abstract

“…Non-reacting flows have been studied both numerically and experimentally. Wittig et al [1] performed experimental and theoretical study of the mixing process between rows of jets and a hot confined crossflow, studying both single and opposite flow injection. Doerr et al [2] performed a series of experiments to study the mixing of non-reacting multiple jets with a confined crossflow.…”

mentioning

confidence: 99%

Effect of jet-to-mainstream momentum flux ratio on mixing process

2015

View full text Add to dashboard Cite

Temperature Profile Development in Turbulent Mixing of Coolant Jets With a Confined Hot Crossflow

Cited by 27 publications

References 0 publications

The Influence of the Recirculation Region: A Comparison of the Convective Heat Transfer Downstream of a Backward-Facing Step and Behind a Jet in a Cross Flow

The Influence of the Recirculation Region: A Comparison of the Convective Heat Transfer Downstream of a Backward-Facing Step and Behind a Jet in a Cross Flow

Numerical Simulation of Combustor Flows on Parallel Computers: Practical Limitations and Practical Experience

Effect of jet-to-mainstream momentum flux ratio on mixing process

Contact Info

Product

Resources

About