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A laboratory simulation of urban hea...

North Carolina State University.

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A laboratory simulation of urban heat-island-induced circulation in a stratified environment.

Record Type:	Electronic resources : Monograph/item
Title/Author:	A laboratory simulation of urban heat-island-induced circulation in a stratified environment./
Author:	Lu, Jie (Jessie).
Description:	190 p.
Notes:	Chairman: S. P. S. Arya.
Contained By:	Dissertation Abstracts International54-02B.
Subject:	Engineering, Mechanical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9317117

A laboratory simulation of urban heat-island-induced circulation in a stratified environment.
Lu, Jie (Jessie).

A laboratory simulation of urban heat-island-induced circulation in a stratified environment. - 190 p.

Chairman: S. P. S. Arya.

Thesis (Ph.D.)--North Carolina State University, 1993.

A three-dimensional heat-island model is established in the convection tank of the Fluid Modeling Facility, U.S. Environmental Protection Agency. Water is used as the working fluid. The model is capable of simulating the temperature and velocity fields induced by a low-aspect-ratio heat island in a calm and stably stratified environment. The convective circulation is turbulent and the Froude number is found to be the controlling parameter when Reynolds-number independence holds. The differences between low- and high-aspect-ratio plumes are discussed and two analytical models, the bulk convective model and the hydrostatic model, are developed for low-aspect-ratio plumes to predict the plume heights, heat-island intensities, and velocity distributions. An extensive and systematic study is conducted to study the heat-island-induced flow with different underlying surface heating rates, heat-island sizes, and different ambient temperature gradients. Different parameterizations and scalings for the heating process, stability effects, velocity fields, and turbulent characteristics are studied, as well as the limitations of the experimental technique. The experimental results are compared with field observations from several cities, previous numerical simulations, and predictions of the analytical models. Good agreement is found with proper convective scalings. The experimental results in their non-dimensional forms, including the thermal plume height, equilibrium height, flow-reversal height, heat-island intensity, the mean horizontal and vertical velocity distributions, and the statistics of temperature and velocity fluctuations, may be applied to any low-aspect-ratio thermal plumes.Subjects--Topical Terms:

783786
Engineering, Mechanical.

A laboratory simulation of urban heat-island-induced circulation in a stratified environment.
LDR:02600nmm 2200277 a 45 001 864677
005 20100727
008 100727s1993 ||||||||||||||||| ||eng d
035 $a (UMI)AAI9317117
035 $a AAI9317117
040 $a UMI $c UMI
100 1 $a Lu, Jie (Jessie). $3 1032930
245 1 2 $a A laboratory simulation of urban heat-island-induced circulation in a stratified environment.
300 $a 190 p.
500 $a Chairman: S. P. S. Arya.
500 $a Source: Dissertation Abstracts International, Volume: 54-02, Section: B, page: 0890.
502 $a Thesis (Ph.D.)--North Carolina State University, 1993.
520 $a A three-dimensional heat-island model is established in the convection tank of the Fluid Modeling Facility, U.S. Environmental Protection Agency. Water is used as the working fluid. The model is capable of simulating the temperature and velocity fields induced by a low-aspect-ratio heat island in a calm and stably stratified environment. The convective circulation is turbulent and the Froude number is found to be the controlling parameter when Reynolds-number independence holds. The differences between low- and high-aspect-ratio plumes are discussed and two analytical models, the bulk convective model and the hydrostatic model, are developed for low-aspect-ratio plumes to predict the plume heights, heat-island intensities, and velocity distributions. An extensive and systematic study is conducted to study the heat-island-induced flow with different underlying surface heating rates, heat-island sizes, and different ambient temperature gradients. Different parameterizations and scalings for the heating process, stability effects, velocity fields, and turbulent characteristics are studied, as well as the limitations of the experimental technique. The experimental results are compared with field observations from several cities, previous numerical simulations, and predictions of the analytical models. Good agreement is found with proper convective scalings. The experimental results in their non-dimensional forms, including the thermal plume height, equilibrium height, flow-reversal height, heat-island intensity, the mean horizontal and vertical velocity distributions, and the statistics of temperature and velocity fluctuations, may be applied to any low-aspect-ratio thermal plumes.
590 $a School code: 0155.
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Physics, Atmospheric Science. $3 1019431
650 4 $a Physics, Fluid and Plasma. $3 1018402
690 $a 0548
690 $a 0608
690 $a 0759
710 2 $a North Carolina State University. $3 1018772
773 0 $t Dissertation Abstracts International $g 54-02B.
790 $a 0155
790 1 0 $a Arya, S. P. S., $e advisor
791 $a Ph.D.
792 $a 1993
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9317117