Scaling of Convective Heat Transfer Enhancement Due to Flow Pulsation in an Axisymmetric Impinging Jet

Persoons, Tim; Balgazin, Kuanysh; Brown, K. J.; Murray, Darina B.

doi:10.1115/1.4024620

Cited by 33 publications

(22 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This study is the first step towards a robust numerical methodology for unsteady impinging flows such as synthetic or pulsating jets ( [9], [20][21][22]). …”

Section: Asme Journal Of Heat Transfermentioning

confidence: 99%

Experimental Validation of a Computational Fluid Dynamics Methodology for Transitional Flow Heat Transfer Characteristics of a Steady Impinging Jet

Alimohammadi

Murray

Persoons

2014

Journal of Heat Transfer

Self Cite

View full text Add to dashboard Cite

This paper presents a computational fluid dynamics (CFD) methodology to accurately predict the heat transfer characteristics of an unconfined steady impinging air jet in the transitional flow regime, impinging on a planar constant-temperature surface. The CFD methodology is validated using detailed experimental measurements of the local surface heat transfer coefficient. The numerical model employs a transitional turbulence model which captures the laminar-turbulent transition in the wall jet which precisely predicts the intensity and extent of the secondary peak in the radial Nusselt number distribution. The paper proposes a computationally low-cost turbulence model which yields the most accurate results for a wide range of operating and geometrical conditions. A detailed analysis of the effect of mesh grid size and properties, inflow conditions, turbulence model, and turbulent Prandtl number Pr t is presented. The numerical uncertainty is quantified by the grid convergence index (GCI) method. In the range of Reynolds number 6,000 ≤ Re ≤ 14,000 and nozzle-to-surface distance 1 ≤ H/D ≤ 6, the model is in excellent agreement with the experimental data. For the case of H/D =1 and Re = 14,000, the maximum deviations are 5%, 3% and 2% in terms of local, area-

show abstract

“…This study is the first step towards a robust numerical methodology for unsteady impinging flows such as synthetic or pulsating jets ( [9], [20][21][22]). …”

Section: Asme Journal Of Heat Transfermentioning

confidence: 99%

Experimental Validation of a Computational Fluid Dynamics Methodology for Transitional Flow Heat Transfer Characteristics of a Steady Impinging Jet

Alimohammadi

Murray

Persoons

2014

Journal of Heat Transfer

Self Cite

View full text Add to dashboard Cite

show abstract

“…The volumetric flow was measured by the induction flow meter (Krohne OptiFlux 5300) and it was used in calculating the mean velocity Figure 6. Comparison of measured experimental data for the impinging jet validation case, h/d = 1, Solnař [22] with literature data by Persoons et al [12], and Katti and Prabhu [4].…”

Section: Validation Of the Method: Impinging Jet Flowmentioning

confidence: 91%

“…According to the distance of the IR camera from the bottom (see Figure 5), the size of the measured point was 3.3 mm/px. Figure 6 compares the experimental results [22] with literature data [4,12] for two different Reynolds numbers.…”

Section: Validation Of the Method: Impinging Jet Flowmentioning

confidence: 99%

“…They presented expressions describing the local Nusselt number in the stagnant, transition, and wall jet regions, and they also proposed a correlation for the stagnant Nusselt number. Persoons et al [12] studied local heat transfer in a pulsating impinging jet for the nozzle-to-surface spacing 1 ≤ h/d ≤ 6, Reynolds numbers 6000 ≤ Re ≤ 14000, and pulsation frequency 0 ≤ f ≤ 55 Hz). Many works also focused on numerical modelling of impinging jets, for example, Draksler et al [13] or Jensen and Walther [14].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Application of the Temperature Oscillation Method in Heat Transfer Measurements at the Wall of an Agitated Vessel

et al. 2018

View full text Add to dashboard Cite

Abstract. The Temperature Oscillation Infra-Red Thermography (TOIRT) was used to measure convective heat transfer coefficients at the inner vertical wall of an agitated and baffled vessel. Two impellers were used: an axial six-blade impeller with pitched blades and the Rushton turbine. The TOIRT method represents an indirect method based on measuring the phase shift between the oscillating heat flux applied to one side of the heat transfer surface and the wall temperature response monitored by a contactless infra-red camera at the same side. On the basis of this phase shift, the TOIRT method can indirectly evaluate the heat transfer coefficient on the other side of the heat transfer surface. Two forms of experimental results are presented in this paper. The first one describes graphical dependencies of the local Nusselt number on the dimensionless distance from the vessel bottom for various Reynolds numbers. The second form describes the mean Nusselt number along the wall as a function of the Reynolds number.

show abstract

“…Persoons et al [5] also measured impinging jet with air, but for lower Reynolds numbers. They used a heat flux sensor which measured the temperature difference across a well-defined thermal barrier.…”

Section: Validationmentioning

confidence: 99%

Heat transfer measurements with TOIRT method

et al. 2017

View full text Add to dashboard Cite

Abstract. Temperature Oscillation Infra-Red Thermography (TOIRT) method was used to measure heat transfer coefficients between a flat surface and a confined impinging jet generated by an impeller in a difusor and baffled vessel. The TOIRT method is based on measuring a phase-lag between the oscillating heat flux applied to the heat transfer surface and the surface temperature response using a contactless infra-red camera. The phase lag is in a direct relationship with the heat transfer coefficient.

show abstract

Scaling of Convective Heat Transfer Enhancement Due to Flow Pulsation in an Axisymmetric Impinging Jet

Cited by 33 publications

References 28 publications

Experimental Validation of a Computational Fluid Dynamics Methodology for Transitional Flow Heat Transfer Characteristics of a Steady Impinging Jet

Experimental Validation of a Computational Fluid Dynamics Methodology for Transitional Flow Heat Transfer Characteristics of a Steady Impinging Jet

Application of the Temperature Oscillation Method in Heat Transfer Measurements at the Wall of an Agitated Vessel

Heat transfer measurements with TOIRT method

Contact Info

Product

Resources

About