[
    {
        "id": "thesis:4869",
        "collection": "thesis",
        "collection_id": "4869",
        "cite_using_url": "https://resolver.caltech.edu/CaltechETD:etd-12082006-131228",
        "primary_object_url": {
            "basename": "Koffman_ld_1980.pdf",
            "content": "final",
            "filesize": 7278580,
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            "url": "/4869/1/Koffman_ld_1980.pdf",
            "version": "v3.0.0"
        },
        "type": "thesis",
        "title": "I. Experimental Observations of the Microlayer in Vapor Bubble Growth on a Heated Solid. II. An Investigation of the Theory of Evaporation and Condensation",
        "author": [
            {
                "family_name": "Koffman",
                "given_name": "Larry Douglas",
                "clpid": "Koffman-Larry-Douglas"
            }
        ],
        "thesis_advisor": [
            {
                "family_name": "Plesset",
                "given_name": "Milton S.",
                "clpid": "Plesset-M-S"
            }
        ],
        "thesis_committee": [
            {
                "family_name": "Plesset",
                "given_name": "Milton S.",
                "clpid": "Plesset-M-S"
            },
            {
                "family_name": "Brennen",
                "given_name": "Christopher E.",
                "clpid": "Brennen-C-E"
            },
            {
                "family_name": "Lees",
                "given_name": "Lester",
                "clpid": "Lees-L"
            },
            {
                "family_name": "Sabersky",
                "given_name": "Rolf H.",
                "clpid": "Sabersky-R-H"
            },
            {
                "family_name": "Wu",
                "given_name": "Theodore Yao-tsu",
                "clpid": "Wu-T-Y-T"
            }
        ],
        "local_group": [
            {
                "literal": "div_eng"
            }
        ],
        "abstract": "Two fundamental problems related to the evaporation of the microlayer formed beneath growing vapor bubbles on a solid surface are investigated. First, experimental measurements of microlayer formation and evaporation have been obtained for nucleate boiling of water and ethanol using laser interferometry combined with high speed photography. For pool boiling of water at atmospheric pressure with low subcooling, the initial microlayer profile is wedge-like with a thickness of 1.85 \u00b5m at a radius of 0.25 mm; the thickness for ethanol is approximately 1.6 times that for water. The measured evaporation rates from the microlayer correspond to local heat fluxes of the order of 1000 kW/m2 over the bubble lifetime. The measurement technique of laser interferometry is discussed in detail with emphasis on the difficulties encountered in interpretation of the fringe patterns. In the second investigation, the theory of evaporation and condensation is considered from a kinetic theory approach. The moment method of Lees is  used to solve the problem of the flow of vapor between a hot liquid surface and a cold liquid surface. A result of the theory is that the temperature profile in the vapor for the continuum problem is inverted from what would seem physically reasonable. Because of this behavior, the theory is questioned on physical grounds leading to the conclusion that the usually assumed boundary conditions for emission of molecules from a liquid surface are probably incorrect.",
        "doi": "10.7907/M1H1-S690",
        "publication_date": "1980",
        "thesis_type": "phd",
        "thesis_year": "1980"
    },
    {
        "id": "thesis:4443",
        "collection": "thesis",
        "collection_id": "4443",
        "cite_using_url": "https://resolver.caltech.edu/CaltechETD:etd-11072006-111631",
        "primary_object_url": {
            "basename": "Prosperetti_a_1974.pdf",
            "content": "final",
            "filesize": 4652212,
            "license": "other",
            "mime_type": "application/pdf",
            "url": "/4443/1/Prosperetti_a_1974.pdf",
            "version": "v2.0.0"
        },
        "type": "thesis",
        "title": "Viscous and Nonlinear Effects in the Oscillations of Drops and Bubbles",
        "author": [
            {
                "family_name": "Prosperetti",
                "given_name": "Andrea",
                "clpid": "Prosperetti-Andrea"
            }
        ],
        "thesis_advisor": [
            {
                "family_name": "Plesset",
                "given_name": "Milton S.",
                "clpid": "Plesset-M-S"
            }
        ],
        "thesis_committee": [
            {
                "family_name": "Plesset",
                "given_name": "Milton S.",
                "clpid": "Plesset-M-S"
            },
            {
                "family_name": "Lagerstrom",
                "given_name": "Paco A.",
                "clpid": "Lagerstrom-P-A"
            },
            {
                "family_name": "Wu",
                "given_name": "Theodore Yao-tsu",
                "clpid": "Wu-T-Y-T"
            },
            {
                "family_name": "Caughey",
                "given_name": "Thomas Kirk",
                "clpid": "Caughey-T-K"
            }
        ],
        "local_group": [
            {
                "literal": "div_eng"
            }
        ],
        "abstract": "NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.\r\n\r\nThe thesis is divided into three parts. In Part I the nonlinear oscillations of a spherical gas bubble in an incompressible, viscous liquid are investigated analytically by means of an asymptotic method. The effect of surface tension is included, and it is shown that thermal and acoustic damping can be accounted for by the suitable redefinition of one parameter. Approximate analytical solutions for the steady state oscillations are presented for the fundamental mode as well as for the first and second subharmonic and for the first and second harmonic. The transient behaviour is also briefly considered. The first subharmonic is studied in particular detail, and a new explanation of its connection with acoustic cavitation is proposed. The approximate analytical results are compared with some numerical ones and a good agreement is found.\r\n\r\nIn Part II the characteristics of subharmonic and ultraharmonic modes appearing in the forced, steady state oscillations of weakly nonlinear systems are considered from the physical, rather than mathematical, viewpoint. A simple explanation of the differences between the two modes, and in particular of the threshold effect usually exhibited by subharmonic oscillations, is presented. The principal resonance in the case of weak excitation is also briefly considered.\r\n\r\nFinally, in Part III the problem of two viscous, incompressible fluids separated by a nearly spherical free surface is considered in general terms as an initial value problem to first order in the perturbation of the spherical symmetry. As an example of the applications of the theory, the free oscillations of a viscous drop are studied in some detail. In particular, it is shown that the normal mode analysis of this problem available in the literature does not furnish a solution correct for all times, but only an asymptotic one valid as [...].",
        "doi": "10.7907/FRDP-DV27",
        "publication_date": "1974",
        "thesis_type": "phd",
        "thesis_year": "1974"
    },
    {
        "id": "thesis:3925",
        "collection": "thesis",
        "collection_id": "3925",
        "cite_using_url": "https://resolver.caltech.edu/CaltechETD:etd-10052004-163535",
        "primary_object_url": {
            "basename": "Wu_yl_1963a.pdf",
            "content": "final",
            "filesize": 1842109,
            "license": "other",
            "mime_type": "application/pdf",
            "url": "/3925/1/Wu_yl_1963a.pdf",
            "version": "v2.0.0"
        },
        "type": "thesis",
        "title": "Flow Generated by Suddenly Heated Flat Plate",
        "author": [
            {
                "family_name": "Wu",
                "given_name": "Ying-Chu Lin Susan",
                "clpid": "Wu-Ying-Chu-Lin-Susan"
            }
        ],
        "thesis_advisor": [
            {
                "family_name": "Lees",
                "given_name": "Lester",
                "clpid": "Lees-L"
            }
        ],
        "thesis_committee": [
            {
                "family_name": "Lees",
                "given_name": "Lester",
                "clpid": "Lees-L"
            },
            {
                "family_name": "Liepmann",
                "given_name": "Hans Wolfgang",
                "clpid": "Liepmann-H-W"
            },
            {
                "family_name": "Plesset",
                "given_name": "Milton S.",
                "clpid": "Plesset-M-S"
            },
            {
                "family_name": "Lagerstrom",
                "given_name": "Paco A.",
                "clpid": "Lagerstrom-P-A"
            },
            {
                "family_name": "Lauritsen",
                "given_name": "Thomas",
                "clpid": "Lauritsen-T"
            }
        ],
        "local_group": [
            {
                "literal": "GALCIT"
            },
            {
                "literal": "div_eng"
            }
        ],
        "abstract": "<p>By employing the two-sided Maxwellian in Maxwell's moment method a kinetic theory description is obtained of the flow generated by a step-function increase in the temperature of an infinite flat plate. Four moments are employed in order to satisfy the three conservation equations, plus one additional equation involving the heat flux in the direction normal to the plate. For a small temperature rise the equations are linearized, and closed-form solutions are obtained for small and large time in terms of the average collision time.</p>\r\n\r\n<p>Initially the disturbances propagate along two distinct characteristics, but the discontinuities across these waves damp out as time increases. At large time the main disturbance propagates with the isentropic sound speed. Solutions for mean normal velocity and temperature show the transition from the nearly collision-free regime to the Navier-Stokes-Fourier regime, which is characterized by a boundary layer near the plate surface merging into a diffuse \"wave\". The classical continuum equations, plus a temperature jump boundary condition, seem to be perfectly adequate to describe the flow beyond a few collision times, provided one accounts properly for the interaction between the inner thermal layer and the outer diffuse wave.</p>",
        "doi": "10.7907/CPQD-RQ29",
        "publication_date": "1963",
        "thesis_type": "phd",
        "thesis_year": "1963"
    },
    {
        "id": "thesis:1282",
        "collection": "thesis",
        "collection_id": "1282",
        "cite_using_url": "https://resolver.caltech.edu/CaltechETD:etd-04072003-091659",
        "type": "thesis",
        "title": "An Experimental and Theoretical Investigation of Two-Dimensional Centrifugal Pump Impellers",
        "author": [
            {
                "family_name": "Acosta",
                "given_name": "Allan James",
                "clpid": "Acosta-Allan-James"
            }
        ],
        "thesis_advisor": [
            {
                "family_name": "Hollander",
                "given_name": "Aladar",
                "clpid": "Hollander-Alandar"
            }
        ],
        "thesis_committee": [
            {
                "family_name": "Plesset",
                "given_name": "Milton S.",
                "clpid": "Plesset-M-S"
            },
            {
                "family_name": "Erd\u00e9lyi",
                "given_name": "Arthur",
                "clpid": "Erd\u00e9lyi-Arthur"
            },
            {
                "family_name": "Hollander",
                "given_name": "Aladar",
                "clpid": "Hollander-Aladar"
            },
            {
                "family_name": "Hudson",
                "given_name": "Donald E.",
                "clpid": "Hudson-D-E"
            },
            {
                "family_name": "Liepmann",
                "given_name": "Hans Wolfgang",
                "clpid": "Liepmann-H-W"
            },
            {
                "family_name": "Rannie",
                "given_name": "W. Duncan",
                "clpid": "Rannie-W-D"
            },
            {
                "family_name": "Stewart",
                "given_name": "Homer Joseph",
                "clpid": "Stewart-H-J"
            }
        ],
        "local_group": [
            {
                "literal": "GALCIT"
            },
            {
                "literal": "div_eng"
            }
        ],
        "abstract": "<p>An experimental and theoretical investigation on a series of three centrifugal pump impellers has been made in order to determine the usefulness and validity of tyro-dimensional potential theory for the description of the flow. Computed values of the developed head and distribution of pressure on the vane surfaces are compared with measurements an two-, four-, and six- bladed impellers which have 30\u00b0 logarithmic spiral vanes and a radius ratio of about one-half.</p>\r\n\r\n<p>It is found that for operating points where the influence on the flow into the impeller by the inlet turn is least, the agreement between the observed and predicted values is reasonably good, while for other flow rates large discrepancies occur. Although the impeller efficiency is relatively high when the flow is least disturbed by the inlet, the slope of the work coefficient line is steeper than the theoretically predicted value. This deviation is attributed to boundary layers which are observed on the vane surfaces.</p>",
        "doi": "10.7907/159P-SA35",
        "publication_date": "1952",
        "thesis_type": "phd",
        "thesis_year": "1952"
    }
]