Abstract
In this paper a patented design of a heat exchanger with minijets, with a cylindrical construction is presented. It is followed by the results of its systematic experimental investigations in the single-phase convection heat transfer mode. Based on these results, validation of selected correlations (coming from the literature) describing the Nusselt number was carried out. An assessment of the heat exchange intensification level in the described heat exchanger was done through the comparison with a shell-and-tube exchanger of a classical design. The thermal-hydraulic characteristics of both units were the subjects of comparison. They were constructed for the identical thermal conditions, i.e., volumetric flow rates of the working media and the media temperatures at the inlets to the heat exchanger. The experimental studies of both heat exchangers were conducted on the same test facility. An increase in the heat transfer coefficients values for the minijets heat exchanger was observed in comparison with the reference one, whereas the generated minijets caused greater hydraulic resistance. Experimentally confirmed intensification of heat transfer on the air side, makes the proposed minijets heat exchanger application more attractive, for the waste heat utilization systems from gas sources.
Highlights
Intensification of heat transfer is an important aspect when considering the construction of the heat exchanger
In order to compare the characteristics of minijet heat exchanger (MJHE) and reference heat exchanger (RHE), tests of both heat exchangers were carried out for the identical volume flow rates of the working fluid and their inlets temperatures
Inshould these tests, thementioned ranges of that the analyzed flow ratesassumptions were extended in adopted during the design of RHE, which was designed to match the size of the heat transfer surface relation to the ranges from the thermal tests
Summary
Intensification of heat transfer is an important aspect when considering the construction of the heat exchanger. Own design of the minijet heat exchanger (MJHE) with cylindrical construction [24], the fluid impinged radially on the cylindrical heat transfer surface. This of inclined impinging jets have shown interaction between the jets and interaction generated the vortical structures, which were propagated by the crossflow along the the crossflow, which has a significant role in the modification of the main flow This interaction heat transferthe surface heat transfer [26]. Theoretical and experimental analyses technology application facilitates in particular the heat transfer at low fluid flow rates and/or with a prototype constructions [27,28] revealed that the innovative idea of jet technology application facilitates small temperature between fluids. 0.002 and the heat Distance transfer wall—heating h (m) between the side, orifice
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