Regarding the design optimization of the heat exchanger, the traditional method of changing the size of the macroscopic structure can no longer meet the increasing demand for heat exchange performance. The superhydrophobic surface can significantly reduce the flow resistance, which is expected to be a new method for the optimal design of heat exchanger. However, when the superhydrophobic effect is applied to a specific type of heat exchanger, its flow and heat transfer performance is not clear. In this paper, the flow and heat transfer model of the traversing superhydrophobic tube bundle is studied. Combined with the FLUENT 18.0 software, the slip boundary conditions of the superhydrophobic surface are deduced, and the flow and heat transfer characteristics of the superhydrophobic tube bundle surface and the wake are numerically analyzed, the influence mechanisms of slip effect on flow and heat transfer characteristics were obtained. Overall, as Ls increases, the comprehensive Nu, also known as heat transfer performance, on the cylindrical surface gradually increases, while the comprehensive Cf, also known as frictional resistance, on the cylindrical surface gradually decreases, indicating that superhydrophobic performance is expected to achieve heat transfer enhancement. The above conclusions can provide a theoretical basis for the optimal design of high-efficiency compact heat exchanger, and have important engineering application significance. 

Numerical study flow and heat transfer characteristics of superhydrophobic single tube bundle surface and wake flow

The characteristics of low-speed streaks in the near-wall region of turbulent cylinder wake/ boundary layer interacting flows are investigated employing hydrogen bubble flow visualization. The results indicate that, in comparison with the undisturbed boundary layer, the mean spanwise streak spacing is reduced downstream of the cylinder. This reduction is particularly marked when the cylinder is close to the wall, and the maximum local spacing reduction reaches 22 % for the experimental conditions. Whereas, raising the cylinder farther from the wall weakens its influence upon streak spacing, and delays the point of maximum reduction downstream.On the other hand, the probability distribution behavior of the streak spacing is not changed by wakes, conforming to lognormal distribution.

Characteristics of low-speed streaks in near-wall turbulence as disturbed by cylinder wakes

This study was conducted to investigate the flow and heat transfer characteristics of a flat plate located between two symmetrical cylinders. Flow visualization experiments were conducted based on ...

Study of flow and heat transfer characteristics around a flat plate located between two symmetrical cylinders

Lung Single-Cell Transcriptomic Analysis During the Development of Pulmonary Arterial Hypertension in the Rat SU5416-Chronic Hypoxia Model

Single Cell Transcriptomic Analysis Reveals Cooperation Between Activated Arterial ECs and Acta2+ Pericytes in Complex Arterial Remodeling in Pulmonary Arterial Hypertension

Embryonic, Organ and Other Tissue Specific Stem Cells: DISCOVERY AND CHARACTERIZATION OF A NOVEL RESIDENT ENDOTHELIAL STEM-LIKE CELL THAT MEDIATES RAPID LUNG MICROVASCULAR REGENERATION IN AN ENDOTHELIAL CELL ABLATION MODEL OF ACUTE LUNG INJURY

Identification by Single-Cell Transcriptomic Analysis of a Novel Endothelial Stem Cell Population Mediating Lung Microvascular Regeneration by an Apelin-Dependent Mechanism

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