Review of various Types of Flow Maldistribution in Heat Exchangers
TL;DR: The types of maldistributions and their causes are discussed in this paper and means of avoiding or curing the problem are given where possible, where the performance loss is often small, there are associated mechanical problems that can be severe.
Abstract: The types of maldistributions and their causes are discussed. Where possible, means of-avoiding or curing the problem are given. While the performance loss is often small, there are associated mechanical problems that can be severe.
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TL;DR: In this paper, a review on application of nanofluids in heat exchangers has been addressed, and it can be concluded that the use of nanophotonics in most cases improves heat transfer, which reduces the volume of heat exchanger, saving energy, consequently water consumption and industrial waste.
325 citations
TL;DR: In this article, an experimental study to investigate two-phase flow distribution in compact heat exchanger manifolds is presented, and an experimental test rig to measure the flow distribution is built.
158 citations
TL;DR: In this paper, a computational fluid dynamics (CFD) program FLUENT has been used to predict the fluid flow distribution in plate-fin heat exchangers, and two modified headers with a two-stage distribution structure are proposed and simulated.
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TL;DR: In this paper, a review of the experimental and numerical results on fluid flow distribution, heat transfer and combination thereof, available in the open literature, is presented, with a set of design recommendations aimed at improving the reactor performance.
126 citations
Cites background from "Review of various Types of Flow Mal..."
...The flow non-uniformity in a microstructured reactor can be divided in gross and channel-tochannel non-uniformity (Mueller and Chiou, 1988)....
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TL;DR: In this paper, a novel technique based on the entrance region pressure drop measurements is presented for monitoring fluid flow maldistribution in individual channels, and validated using liquid water flow in a test section with four tubes in parallel.
120 citations
Cites background from "Review of various Types of Flow Mal..."
...For example, gross flow maldistribution leads to significant reduction in effectiveness for high NTU heat exchangers [1], about 7% for condensers, and up to 25% for cross-flow exchangers [2]....
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...Mueller and Chiou [1] list various factors responsible for flow maldistribution in a shell and tube heat exchanger: entry problems due to header design, bypass streams and fabrication tol-...
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...Mueller and Chiou [1] list various factors responsible for flow maldistribution in a shell and tube heat exchanger: entry problems due to header design, bypass streams and fabrication tol- ll rights reserved....
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References
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TL;DR: In this paper, the authors identify the causes and mechanisms of thermal-hydrodynamic instabilities in boiling flow in a water-cooled reactor, an evaporator, or an electronic cooling system.
708 citations
TL;DR: In this article, an extended acoustic theory is worked out for a gas-filled resonance tube, and the results show cooling in the section of the tube with maximum velocity amplitude and marked heating in the region of the velocity nodes.
Abstract: New experiments with a gas-filled resonance tube have shown that not only heating, but also cooling of the tube wall is possible and that these phenomena are not restricted to oscillation amplitudes that generate shocks. The present paper concentrates on amplitudes outside the shock region. For this case, an extended acoustic theory is worked out. The results show cooling in the section of the tube with maximum velocity amplitude (and thus dissipation) and marked heating in the region of the velocity nodes. A strong dependence of these effects on the Prandtl number is noted. The results are in good agreement with experiments. Although the theory is not valid for proper resonance conditions, it nevertheless sheds some light on what happens when nonlinear effects dominate.Closely related to the limit of validity of the thermoacoustic theory is the question of transition from laminar to turbulent flow in the viscous boundary layer (Stokes layer). This problem has also been investigated; the results are given in a separate paper (Merkli & Thomann 1975). In the present article laminar flow is assumed.
165 citations
TL;DR: In this article, the major references on Rijke oscillations are listed and reviewed briefly, and the extensive literature on oscillatory combustion occurring in rocket propulsion systems is not reviewed.
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TL;DR: In this article, a review of the available literature on Sondhauss oscillations is listed and reviewed briefly; however, the extensive literature on oscillatory combustion occurring in rocker propulsion systems is not reviewed.
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