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Heemskerk, J.F. (author), Delil, A.A.M. (author), Daniels, D.H.W. (author)The thermal conductivity of a honeycomb sandwich panel was mesisured in the three characteristic directions. The measurements were carried out in the NLR space simulation chamber. The results are in good agreement with values calculated for a simplified model.report 1971
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Delil, A.A.M. (author), Heemskerk, J.F. (author)The thermal performance of evacuated multilayer insulation blankets depends on three modes of energy transfer: radiation between the radiation shields, gas conduction m the residual interstitial gas and solid conduction via the contacting interfaces. The importance of the contributions of the three heat transfer modes depends on many parameters...report 1975
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Delil, A.A.M. (author), Heemskerk, J.F. (author)The thermal performance of multilayer insulation hlankets depends on three (interacting) modes of energy transfer: radiation between the radiation shields, gas conduction in the residual interstitial gas and solid conduction via the contacting interfaces. The contribution of the gas conduction depends on the interstitial gas and its pressure,...report 1976
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Delil, A.A.M. (author)The scope of this report is: - to give a short description of the possible operation principles and applications of heat pipes - to derive the governing equations for a model of a conventional heat pipe (including the limits to the heat transfer capability) - to describe the theoretical derivation of the formulae for the various thermal...report 1976
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Delil, A.A.M. (author), Heemskerk, J.F. (author)The experiment described is proposed to be performed on the first spacelab mission. Its scientific goal is the study of heat transfer to liquid helium above and below the lambda point under nearly zero gravity conditions. Technological results to be expected, are in the field of cooling with cryogens and management of cryogens in space. The...report 1976
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Delil, A.A.M. (author)Electro-osmosis is a physical phenomenon that originates in electrokinetics i.e. the conveyance of the relative movement of a liquid and a solid by a potential drop at the interface. In fact it is the reversed process: application of an electric field across a solid-liquid interface results into movement of the liquid if the solid is fixed....report 1977
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The influence of outgas on the performance of multilayer insulation blankets with perforated shieldsHeemskerk, J.F. (author), Delil, A.A.M. (author)Reported are the results of the first measurements of a series of performance experiments with nonperforated and perforated blankets. The mathematical description of the performance is considered to be in reasonable agreement with the measurements in the nonperforated case. For perforated blankets the pressure distribution inside the blanket...report 1977
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Delil, A.A.M. (author), Heemskerk, J.F. (author)Heat balance research with a thin-balled cube was initiated to verify heat balance computer programmes of the nodal network type. The heat balance experiments were carried out in a simulated space environment (inside the NLR thermal—vacuum chamber with liquid nitrogen cooled shroud, using a carbon arc solar simulator). The experimentally...report 1978
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Delil, A.A.M. (author)Electro-osmosis has been suggested in literature as an additional pumping mechanism in heat pipes. This report summarizes the underlying theory and derives the equations that govern the performance of an electro-osmotic heat pipe (EOHP) equipped with a homogeneous wick. Based on these equations, a parameter analysis and calculations were...report 1978
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- Wanhill, R.J.H. (author), de Graaf, E.A.B. (author), Delil, A.A.M. (author) report 1979
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Delil, A.A.M. (author)Electro-osmosis has been stoggested in literature as an additional pumping mechanism in heat pipes. The performance of a feedback controllable electroosmotic heat pipe (PCHP), analyzed in an earlier phase of this study, was reported, including corollary application areas (NLR TR 78I42 L), Unfortunately the heat transport capability of such an...report 1979
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van der Vooren, J. (author), Delil, A.A.M. (author), Sanderse, A. (author)A new uniaxial model for a gas loaded variable conductance heat pipe (VCHP) is developed. This model takes into account the diffusion at the vapour-gas interface as well as the inertial effects of the moving vapour. Only steady-state conditions are considered. The generally accepted Edwards /Marcus model will be shown to be a first order...report 1980
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Uniaxial model for gas-loaded variable conductance heat pipe performance in the inertial flow regimevan der Vooren, J. (author), Delil, A.A.M. (author)A uniaxial model for the thermal performance of a variable conductance heat pipe (VCHP) has been developed at NLR. The model, so far, accounts for diffusion at the vapour/gas interface as well as for inertia! effects of the moving vapour, Calculations performed have shown that the diffusion effects are of minor importance in comparison with the...report 1981
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Heemskerk, J.F. (author), Delil, A.A.M. (author)Models describing the thermal performance of evacuated multilayer insulation blankets are usually^ based on the simple addition of the three mutually interacting modes of energy transfer: radiation between the shields, solid conduction via the components and their interfaces and gas conduction in the interstices, determined by residual gas...report 1981
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Delil, A.A.M. (author)Research performed at NLR (partly under contract with the Netherlands Agency for Aerospace Programs NIVR) led to a promising variable conductance heat pipe concept based on electro-osmosis: the feedback controllable electroosmotic heat pipe (EOHP). Such an EOHP basically is a variable conductance heat pipe of which the control properties are...report 1982
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Delil, A.A.M. (author)Radiation heat transfer is a non-negligible physical process in an open-cycle magnetohydrodymic generator. It constitutes an important part of the energy conservation law, one of the fundamental equations describing the behaviour of the MHD combustion gas in the generator. Radiation heat transfer is modelled following the generally accepted...report 1983
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Delil, A.A.M. (author)Beschreven wordt de wijze van aanpak om de samenstelling van een MHD rookgas als functie van temperatuur en druk te bepalen. Kennis van deze samenstelling is onder meer noodzakelijk om de plaatsafhankelijke thermo-optische eigenschappen van het rookgas en de stralingsoverdracht in het generatorkanaal te kunnen berekenen. Tevens worden de...report 1983
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- Delil, A.A.M. (author), Daniels, H.A.M. (author) report 1983
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Delil, A.A.M. (author)A uniaxial model for the transient performance of gas-loaded variable conductance heat pipes is being developed, partly under contract with the Netherlands Agency for Aerospace Programs NIVR. The model has to be easily implementable in existing spacecraft thermal analyzer computer programs. So far, a steady-state version of the model is...report 1984
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Delil, A.A.M. (author)Some results of space-related thermophysical research are reviewed. Theoretical and experimental work carried out by the NLR Space Division concerns: - the thermal conductivity of (anisotropic) sheet materials, and of metallic and CFRP honeycomb sandwich panels; the thermal resistance of joints, interstice materials, etc. - the design and...report 1984