Fluerics 31. The Transition from Isothermal to Adiabatic Capacitance in Cylindrical Enclosures
Abstract
The capacitance of enclosed volumes depends on the polytropic exponent. The relation between this exponent, frequency, and tank size is calculated for cylindrical enclosures from Daniels' acoustic theory. Daniels' solution is also used to find an average polytropic exponent for fluid capacitive circuits subjected to rectangular pulses of up to 8-sec duration. Frequency response tests with finite amplitude are performed on fluid RCR circuits to determine the correspondence between the theory and the capacitance measured on lumped parameter circuits. The calculated data fall within 20 percent of the theory for circuits without through-flow. Tests with small amounts of through-flow show only slight differences. The tendency is for through-flow to maintain isothermal conditions at frequencies above those that occur without through-flow.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1971
- Accession Number
- AD0735704
Entities
People
- Edgar Hastie
- Silas Katz
Organizations
- Harry Diamond Laboratories