Experimental investigation of forced flow boiling of nitrogen in a horizontal corrugated stainless steel tube

Su, Xuemei; Chen, Xingya; Liu, Jionghui; Chen, Shuangtao; Hou, Yu

doi:10.1016/j.cryogenics.2015.05.001

Cited by 13 publications

(1 citation statement)

References 23 publications

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“…In recent years, different methods have been proposed to increase the heat transfer in various industrial applications such as roughness on the surface [1][2][3][4][5][6][7], inserts in the tubes [8][9][10], phase change [11][12][13], additives in the fluids [14][15][16], and external vibrations or electromagnetic field [17][18][19]. Several studies examined the inward helically corrugated tube as a passive heat transfer enhancement technique that can disturb boundary layers on both sides of the tube wall without external energy input and can be easily obtained [20].…”

Section: Introductionmentioning

confidence: 99%

Entropy generation analysis of fully-developed turbulent heat transfer flow in inward helically corrugated tubes

Wang

Zhang

Liu

et al. 2018

Numerical Heat Transfer, Part A: Applications

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The entropy generation analysis of fully-developed turbulent heat transfer flow in inward helically corrugated tubes was numerically performed by using a Reynolds stress model. The simulations were conducted for a smooth tube and five cases of corrugated tubes with Reynolds number (Re) ranging from 10,020 to 40,060 at a constant wall temperature condition. The effects of corrugation pitch and height on the flow patterns as well as local thermal and frictional entropy generation are detailed in the near wall region. The results indicate that the local heat transfer entropy generation is significantly evident at the sub-layer region and the detached vortex region, and the local thermal entropy is improved with increases in the secondary flow. Local friction entropy generation is mainly located at the windward of the corrugation and the severely turbulent fluctuation region and is mainly induced by the velocity gradient. The average friction entropy generation exhibits an exponential growth, while the average heat transfer and the total entropy generation display a linear growth trend with increased Re. The average Bejan number (Be) exhibits an exponential decline, and the minimum value can reach 0.69. From a comprehensive viewpoint, it is optimal for the Re to be lower than 30,050. When Re <20,030, higher and dense corrugations are beneficial. When 20,030 < Re <30,050, low and spare corrugations are more optimal. Besides, the case with Hl/D ¼ 0.08 is not recommended. ARTICLE HISTORY

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Section: Introductionmentioning

confidence: 99%

Entropy generation analysis of fully-developed turbulent heat transfer flow in inward helically corrugated tubes

Wang

Zhang

Liu

et al. 2018

Numerical Heat Transfer, Part A: Applications

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Optimal design of coolant jacket for cryogen transfer pipelines

Sivasree,

Nitin

2024

Can J Chem Eng

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Cryogenic liquids such as liquid oxygen and liquid hydrogen are extensively used in many processes and manufacturing industries. In these industries, transferring cryogens via pipelines is a routine phenomenon. As the boiling points and latent heat of cryogens are low, excessive vaporization of these cryogens is innate. Therefore, ensuring that the cryogen reaches the utility in its liquid form is challenging. In the case of liquid hydrogen and liquid helium, the pipelines are jacketed with a high boiling cryogen like nitrogen. The idea is to dump most of the heat into cheap nitrogen to limit the loss of precious hydrogen or helium. From a heat inleak point, maximizing the amount of nitrogen in the jacket is advantageous by choosing large cross‐sectional areas. Also, larger flow cross sections would lower pressure drops and, therefore, lower pumping costs. However, such a choice would add to the mass of the pipeline. An increase in the mass of the pipeline increases the need for better structural support of the pipeline assembly. Therefore, the design of cryogen jackets for limiting heat inleak is a multi‐objective optimization problem. In this work, we model the heat leak into the hydrogen via the nitrogen jacket and the pressure drop of liquid nitrogen, and we find the mass of the pipeline assembly. Then, we optimize the design of nitrogen jackets fitted over hydrogen pipelines. We employ the evolutionary optimization technique, genetic algorithm (GA), to perform this optimization.cryogen; genetic algorithm; heat inleak; liquid hydrogen; optimization.

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Experimental study on heat transfer characteristics of LN2 saturated flow boiling in a horizontal corrugated tube

Chen

Zhang

et al. 2017

Experimental Thermal and Fluid Science

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Experimental investigation of forced flow boiling of nitrogen in a horizontal corrugated stainless steel tube

Cited by 13 publications

References 23 publications

Entropy generation analysis of fully-developed turbulent heat transfer flow in inward helically corrugated tubes

Entropy generation analysis of fully-developed turbulent heat transfer flow in inward helically corrugated tubes

Optimal design of coolant jacket for cryogen transfer pipelines

Experimental study on heat transfer characteristics of LN2 saturated flow boiling in a horizontal corrugated tube

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