Development of a compact laminar flow heat exchanger with stainless steel micro-tubes

Saji, Nobuyoshi; Nagai, S.; Tsuchiya, Kazuyuki; Asakura, Hiroshi; Obata, Masakazu

doi:10.1016/s0921-4534(01)00064-8

Cited by 13 publications

(6 citation statements)

References 1 publication

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“…Produced by Koch Heat Transfer Company, the tube bundle of such HE (see Figure 3.20a) has helix-shaped tubes, which are arranged in a triangular pattern. Saji et al (2001) described the construction of microtube HE for low-temperature (less than 20 K) refrigeration cycle. Complex swirl flow on the shell side induces the maximum turbulence to improve heat transfer and also high tube side turbulence is achieved.…”

Section: Compact Shell and Tube Heat Exchangersmentioning

confidence: 99%

See 1 more Smart Citation

Compact Heat Exchangers

Klemeš¹,

Arsenyeva²,

Kapustenko³

et al. 2015

Compact Heat Exchangers for Energy Transfer Intensification

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Section: Compact Shell and Tube Heat Exchangersmentioning

confidence: 99%

“…Even shell-and-tube heat exchangers can be made with microchannels, see, for example Saji et al (2001). But with the need for compactness and advances in fabrication technologies, any type of heat exchanger can be made smaller by the reduction of scale.…”

Section: Miniscale Mchementioning

confidence: 99%

Compact Heat Exchangers

Klemeš¹,

Arsenyeva²,

Kapustenko³

et al. 2015

Compact Heat Exchangers for Energy Transfer Intensification

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“…From a primary surface (tube) perspective, heat transfer coefficients inversely proportional to diameter (Bacellar et al 2014a;Bacellar et al 2014b;Chen et al 2016;Kasagi et al 2003;Paitoonsurikarn et al 2000;Saji et al 2001), thus having very high values in particular for diameters below 1.0 mm. A major shortcoming of round tubes, however, is the friction resistance, which is also inversely proportional to the diameter.…”

Section: Introductionmentioning

confidence: 99%

Design optimization and validation of high-performance heat exchangers using approximation assisted optimization and additive manufacturing

Bacellar

Aute

Huang

et al. 2017

Science and Technology for the Built Environment

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The airside thermal resistance of air-to-fluid heat exchangers dominates the overall thermal resistance. On conventional heat exchanger's, fins are required to address such challenges; but their benefits are not limitless and are bound mainly by the tube size and shape. The reduction of the tube characteristic length has favorable impact on compactness and heat transfer. Conventional tubes are typically limited to round, elliptical or flat shapes which result in particular thermal-hydraulic characteristics. The current article has three main objectives. First, discuss the importance of fins on typical air-to-fluid heat exchanger's and how they become unattractive at smaller characteristic lengths with numerical analyses to support this argument from different perspectives. Second, present a proof-of-concept design with small finless tubes and a novel shape that can outperform a microchannel heat exchanger. Third, present a comprehensive analysis with shape optimization leveraging automated computational fluid dynamics simulations and approximation assisted optimization techniques. Optimum designs can achieve more than 50% reduction in size, material, and pressure drop compared to the baseline microchannel heat exchanger. The method is validated with the experimental validation of a metal three-dimensional printed prototype of the NTHX-001. The numerical simulations agreed within less than 5% in capacity, 10% in air heat transfer coefficient, and 15% in air pressure drop.

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“…They proposed an analytical solution validated by experimental and simulation data and concluded that the Poiseuille number is only a function of the cross-section geometrical parameters and the polar moment of inertia. Saji et al 29 tested a compact tubular microheat-exchanger with an internal diameter of 0.5 mm that could achieve a temperature variation of less than 4 K. Bau 30 deal with flow distribution and scaling, 18−20 characteristic times, 8,9 channel flow fields, 32 heat-transfer augmentation, 33,34 aspect ratio selection, 35 scaling, 36 and parameter optimization. 37 Heat exchanger microreactors (HEMR) help to remove the heat generated by exothermic reactions 8,32,38 more efficiently, thereby achieving isothermal operation.…”

Section: ■ Introductionmentioning

confidence: 99%

Design of Micro- and Milli-Channel Heat Exchanger Reactors for Homogeneous Exothermic Reactions in the Laminar Regime

Rodríguez-Guerra

Gerling

López-Guajardo

et al. 2016

Ind. Eng. Chem. Res.

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Considerable efforts have been made to study heat exchanger microreactors. However, the starting point in design for the selection of an adequate length scale that takes into account both the maximum temperature rise and pressure drop, important criteria for the holistic design of such equipment, is still missing. An attempt has been made in the present communication to provide such relationship over a wide range of operating variables. Fast and simple guidelines are discussed for beginning to design a heat exchanger microreactor for exothermic reactions where the maximum temperature deviation inside the reactor, called the hotspot temperature, can be predicted by calculating the overall heat and the maximum heat release rate. The applicability of the proposed guidelines was tested using experimental and simulation data from other authors.

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Development of a compact laminar flow heat exchanger with stainless steel micro-tubes

Cited by 13 publications

References 1 publication

Compact Heat Exchangers

Compact Heat Exchangers

Design optimization and validation of high-performance heat exchangers using approximation assisted optimization and additive manufacturing

Design of Micro- and Milli-Channel Heat Exchanger Reactors for Homogeneous Exothermic Reactions in the Laminar Regime

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