Study on Recuperator for Ultramicro Gas Turbine

Nagasaki, Takao; Ito, Yutaka

doi:10.1299/jsmepes.2004.9.31

Cited by 4 publications

(10 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For our study, we have selected the values of the geometrical parameters and the Reynolds number in accordance with the applications of offset strip fin arrays in micro-and mini-channels (Refs. [5][6][7][8][9][10][11][12][13], as enlisted in Table III. These values of the geometrical parameters result in a porosity ranging from 0.44 to 0.97.…”

Section: Friction Factor For Periodically Developed Flowmentioning

confidence: 99%

“…In particular, micro-and minichannels with periodic arrays of offset strip fins have gained a lot of interest (Refs. [5][6][7][8][9][10][11][12][13]. This is primarily due to the compactness this type of fin surface enables for heat transfer devices, which offers great potential in the ongoing trend toward higher power densities in many applications (Refs.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the available data mainly applies to offset strip fins with larger fin heightto-length ratios than those common in micro-and mini-channel applications (Refs. [5][6][7][8][9][10][11][12][13][14]. Therefore, this work aims to study the pressure drop for flow through offset strip fin arrays in micro-and minichannels.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Friction factor for steady periodically developed flow in micro- and mini-channels with arrays of offset strip fins

et al. 2021

View full text Add to dashboard Cite

In this work, the friction factor for steady periodically developed flow through micro-and mini-channels with periodic arrays of offset strip fins is analyzed. The friction factor is studied numerically on a unit cell of the array for Reynolds numbers ranging from 1 to 600, and fin height-to-length ratios below 1. It is shown that the friction factor correlations from the literature, which primarily focus on larger conventional offset strip fin geometries in the transitional flow regime, do not predict the correct trends for laminar flow in micro-and minichannels. Therefore, a new friction factor correlation for micro-and mini-channels with offset strip fin arrays is constructed from an extensive set of numerical simulations through a least squares fitting procedure. The suitability of this new correlation is further supported by means of the Bayesian approach for parameter estimation and model validation. The correlation predicts an inversely linear relationship between the friction factor and the Reynolds number, in accordance with our observation that a strong inertia regime prevails over nearly the entire range of investigated Reynolds numbers. Yet, through a more detailed analysis, also the presence of a weak inertia regime and a transitional regime is identified, and the transitions from the strong inertia regime are quantified by means of two critical Reynolds numbers. Finally, the new correlation also incorporates the asymptotic trends that are observed for each geometrical parameter of the offset strip fin array, and whose origins are discussed from a physical perspective.

show abstract

Section: Friction Factor For Periodically Developed Flowmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Friction factor for steady periodically developed flow in micro- and mini-channels with arrays of offset strip fins

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Following a review of prior recuperator art; Micro channel [4] [5], Stamp and folded [6], Offset-strip-fin [7], Corrugated plate fin -RSAB recuperator [8] [9], Annular -Capstone [10], Swiss roll [11] [12], Rolls-Royce spiral recuperator [13] [14], ACTE spiral recuperator [15] [14] and speculative investigation into alternative recuperator proposals [16] a coiled pipe-in-pipe recuperator was selected for further investigation.…”

Section: Introductionmentioning

confidence: 99%

Exploration of a simple, low cost, micro gas turbine recuperator solution for a domestic combined heat and power unit

Clay¹,

Tansley²

2011

Applied Thermal Engineering

View full text Add to dashboard Cite

“…Hereby focus is especially put on technological requirements and low cost fabrication technology rather than on optimization for achieving maximal cycle efficiency [7]. Also at smaller scales, for micro gas turbines in the power range smaller than 3 kW, several micro recuperators are described in literature [8][9][10]. Thus far, almost no attention is paid to the generalization of these concepts in specific design rules.…”

Section: Introductionmentioning

confidence: 99%

Optimal micro channel recuperators for small-sized gas turbines

Baelmans

Rogiers

Eyndhoven

et al. 2008

2008 Second International Conference on Thermal Issues in Emerging Technologies

View full text Add to dashboard Cite

Thermodynamic efficiencies based on the first and second law of thermodynamics are assessed for their use in the design of recuperators in small-sized gas turbines. It is shown that the first and second law cycle efficiency as well as the Witte-Shamsundar efficiency [1] for heat exchangers show a similar dependency on the heat exchanger pressure drops. This results in design relations for hydraulic diameter ratios and their related number of channels ratio. Further, it is shown that the WitteShamsundar efficiency focusing on heat exchanger inlet temperatures only can be used as a good approximation for the overall optimal recuperator design when also pressure drops over the recuperator are accounted for. However the approximation deteriorates with higher heat exchanger mass flow density and lower compressor ratio as well as with decreasing turbine inlet temperature ratio. Deviations from the full cycle efficiency considerations are assessed. It is concluded that the use of the WitteShamsundar efficiency for optimization of recuperators in small-sized applications like the 1.5 kW PowerMems gas turbine needs careful assessment.

show abstract

Study on Recuperator for Ultramicro Gas Turbine

Cited by 4 publications

References 0 publications

Friction factor for steady periodically developed flow in micro- and mini-channels with arrays of offset strip fins

Friction factor for steady periodically developed flow in micro- and mini-channels with arrays of offset strip fins

Exploration of a simple, low cost, micro gas turbine recuperator solution for a domestic combined heat and power unit

Optimal micro channel recuperators for small-sized gas turbines

Contact Info

Product

Resources

About