Thermal analysis of heat transfer performance in a horizontal tube bundle

Shen, Shengqiang; Liu, Hua; Gong, Liangyi; Yang, Yong; Liu, Rui

doi:10.1080/19443994.2014.895780

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…Mu et al [1,2] and Shen et al [3,4] conducted a comprehensive study on the flow characteristics and heat transfer efficiency of fluids in falling film evaporators. They also studied in detail the various factors affecting heat transfer, such as heat flux density, number of tubes, spray density, evaporation temperature, etc., and studied the difference in heat transfer between seawater and freshwater as experimental fluids.…”

Section: Introductionmentioning

confidence: 99%

Study on liquid film thickness and flow characteristics of falling film outside an elliptical tube

Zhang¹,

Zhu²,

Q³

2019

DWT

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A three-dimensional model is applied to simulate the spreading process and thickness distribution of the liquid film outside an elliptical horizontal tube falling-film heat exchanger. Reynolds number (Re) is 187 and the counter-current air flow rates are 0, 0.1 and 0.5 m/s, respectively. The volume of fluid method is used to trace the gas-liquid interface. It is shown that falling film flow delays and the liquid film thickness increases as the gas flow rate increases. When the counter-current gas flow rate is increased to 0.5 m/s, the falling film distribution becomes uneven and local accumulation occurs. Along the circumferential direction, the liquid film velocity increases as the gas flow rate increases.

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Section: Introductionmentioning

confidence: 99%

Study on liquid film thickness and flow characteristics of falling film outside an elliptical tube

Zhang¹,

Zhu²,

Q³

2019

DWT

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“…They revealed that heat transfer and the friction factor increased with the oblique angle. Shen et al [29] analyzed the heat transfer performance of horizontal tube bundles. They concluded that a greater column number of tube bundles weakens the heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Thermal Characteristics of Tube Bundles in Ultra-Supercritical Boilers

et al. 2016

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Abstract:In this study, flow and thermal characteristics of tube bundles in ultra-supercritical boilers were analyzed. The local heat transfer around the tube bundles was measured to predict the local temperature distribution and vulnerable positions of the superheated tube bundles. The maximally superheated tube bundles were simulated in the laboratory and local heat transfer was measured by using the naphthalene sublimation method. The experiment was conducted on three lines of tube bundles, all with in-line arrangements. Each line consist of six tubes. The distance in the streamwise direction (S x /∅) was 1.99 and that in the spanwise direction (S z /∅) was 5.45. The Reynolds number varied from 5000 to 30,000, which covers a range of different operating conditions. Thermal and stress analyses were conducted numerically, based on the experimental data. The results showed that the flow characteristic changes the local heat transfer of the tube bundles. The flow impinged on the stagnation point of Tube 1 and reattached at 60 • of Tube 2. The high heat transfer occurred at those positions of the tube bundles. The temperature and stress distributions on the surface of each tube bundle also varied. The reattachment point on Tube 2 had the highest heat transfer and temperature distribution. That position on Tube 2 was subjected to the highest stress due to the large temperature gradient. This result indicates that Tube 2 of the ultra-supercritical (USC) boiler is the weakest of the tube bundles, changing the pitch of the streamwise direction of Tube 2 is one method to reduce the highest stress in superheater tube bundles in the USC boiler.

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Effects of film flow rate on falling film flow with dominant evaporation and simultaneous evaporation and boiling

Hassani

Kouhikamali

2020

Heat Mass Transfer

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Thermal analysis of heat transfer performance in a horizontal tube bundle

Cited by 4 publications

References 11 publications

Study on liquid film thickness and flow characteristics of falling film outside an elliptical tube

Study on liquid film thickness and flow characteristics of falling film outside an elliptical tube

Thermal Characteristics of Tube Bundles in Ultra-Supercritical Boilers

Effects of film flow rate on falling film flow with dominant evaporation and simultaneous evaporation and boiling

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