Process Intensification for Compact and Micro Heat Exchangers through Innovative Technologies: A Review

Singh, Jogender; Montesinos‐Castellanos, Alejandro; Nigam, K.D.P.

doi:10.1021/acs.iecr.9b02082

Cited by 26 publications

(4 citation statements)

References 221 publications

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“…Heat transfer enhancement is one of the primary concerns in a variety of applications, may it be for carrying out an exothermic/endothermic reaction or as a heat exchanger. 71 A number of passive heat transfer enhancement techniques have been developed with different insert designs which enhance convective heat transfer due to the generation of the swirling effect or diffusion. 72 Heat transfer enhancement has successfully been demonstrated due to swirl, but the problem of dead zones has not yet been completely overcome for compact designs.…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

Passive Mixer cum Reactor Using Threaded Inserts: Investigations of Flow, Mixing, and Heat Transfer Characteristics

Khalde

Ramanan

Sangwai

et al. 2019

Ind. Eng. Chem. Res.

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Significant efforts have been and are being spent on developing intensified tubular reactors for continuous manufacturing of fine and specialty chemicals. In this work, we have proposed a new design of passive mixer-cum-reactor for process intensification and development of continuous processes. The mixer/reactor consists of threaded inserts with cone-shaped ends, placed concentrically in the tube such that fluid flows through the annular region between the inserts and the tube. The proposed design is easy to fabricate, maintain, and overcomes the limitations of scale up/scale down compared to most of the commercial passive mixers. The split and recombine of flow around inserts, the swirling effect generated by threads, change in the swirl direction due to change in the direction of screw threads, and pinching effect/expansion at the cone-cone shaped ends realize desired enhancements in mixing and heat transfer. A detailed computational study has been carried out on the mixer-cum-reactor to characterize flow, mixing and heat transfer at different operating conditions using a verified and validated CFD model. Various designs and configurations of threaded inserts were considered: 5-channel, 7-channel and 9-channel, smooth surface (no threading) and smooth surface-extended rear end inserts. The flow, mixing and heat transfer were characterized over the Reynolds number range of 100 to 1600. Structure of the generated swirling flow, effect of pinching/expansion, direction reversal of flow, tracer fraction, temperature and path lines were investigated systematically to gain new insights. Threaded inserts could achieve excellent mixing (>99 % of mixing intensity) and heat transfer (7 times smooth inserts and 20 times without inserts). The presented results will provide a sound basis for selecting appropriate threaded inserts for intensifying mixing and heat transfer in tubular reactors. The work also provides a useful starting point for further work on multiphase flows in a tubular reactor with threaded inserts.

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Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

Passive Mixer cum Reactor Using Threaded Inserts: Investigations of Flow, Mixing, and Heat Transfer Characteristics

Khalde

Ramanan

Sangwai

et al. 2019

Ind. Eng. Chem. Res.

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“…In addition, since the alternately stacked cold and hot channel plates are bonded using a diffusion-bonding process, the PCHEs have outstanding mechanical properties under high-temperature and high-pressure conditions. Because of these advantages, there has been a growing interest in the development of PCHEs for application to small modular reactors [9,10]. However, some challenges should also be addressed for the implementation of nuclear PCHEs.…”

Section: Introductionmentioning

confidence: 99%

Chemical Cleaning of Magnetite Deposits on the Flow Mini-Channels of a Printed Circuit Heat Exchanger in an EDTA-Based Solution

et al. 2022

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The dissolution behavior of magnetite deposited on flow mini-channel surfaces within a printed circuit heat exchanger (PCHE) and the corrosion behavior of a STS 316L PCHE material were investigated in an ethylendiaminetetraacetic acid (EDTA)-based chemical cleaning solution at 93 °C. The fouling in the PCHE was simulated using a water-steam circulation loop system. Most of the magnetite deposits were rapidly dissolved in the early stage of the circulation chemical cleaning. An empirical equation for estimating the dissolution percentage was derived as a function of cleaning time. The PCHE material showed excellent corrosion resistance during the chemical cleaning tests. These results indicate the fouling layers in the PCHEs can be removed efficiently by the chemical cleaning process without concern about base metal corrosion.

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“…It exploits the fundamental microfluidic phenomena for mixing, matter and heat transfer, separation, etc., to maximize the effectiveness of intra- and intermolecular events . The foundational, distinguishing feature of this approach is the high degree of precision control over the flow rates and process conditions, resulting in excellent reproducibility and precise tuning of the product size, composition, morphology, and properties. − These features are desirable for steady-state operation and industrial production. Furthermore, microfluidic devices feature well-defined flow patterns and allow for complex fluid manipulation, thus extending the microreactor capabilities to meet the ever-increasing demands for improving process miniaturization, automation, throughput, parallelism, integration, and continuity.…”

Section: Introductionmentioning

confidence: 99%

Microfluidic Plasma-Based Continuous and Tunable Synthesis of Ag–Au Nanoparticles and Their SERS Properties

Lin

Gao

et al. 2021

Ind. Eng. Chem. Res.

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This work reports on an effective approach for the continuous synthesis of Ag–Au nanoparticles (NPs) by integrating low-temperature plasma with a microfluidic technique. Crystalline Ag–Au nanoalloys are demonstrated to be produced, and the composition of the nanoalloys can be effectively tuned in-flight by controlling the concentrations or the flow rates of the reactants. The surface-enhanced Raman scattering (SERS) properties of the NPs are further validated through the detection of rhodamine 6G and crystal violet (CV) analytes. The silicon substrates coated with the Ag–Au NPs have reproducible morphology and thickness, and can significantly enhance the Raman signals, where nanoalloys show much higher Raman responses compared to monometallic Ag and Au NPs. The Ag–Au-functionalized SERS platforms show excellent reproducibility and stability, with the detection limits of 10–8 and 10–10 M for the rhodamine 6G (R6G) and CV molecules, respectively. These results indicate that the developed microfluidic plasma method is promising for the continuous and in-flight synthesis of tunable monometallic or multimetallic nanoparticles.

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Process Intensification for Compact and Micro Heat Exchangers through Innovative Technologies: A Review

Cited by 26 publications

References 221 publications

Passive Mixer cum Reactor Using Threaded Inserts: Investigations of Flow, Mixing, and Heat Transfer Characteristics

Passive Mixer cum Reactor Using Threaded Inserts: Investigations of Flow, Mixing, and Heat Transfer Characteristics

Chemical Cleaning of Magnetite Deposits on the Flow Mini-Channels of a Printed Circuit Heat Exchanger in an EDTA-Based Solution

Microfluidic Plasma-Based Continuous and Tunable Synthesis of Ag–Au Nanoparticles and Their SERS Properties

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