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Best Hypothesis for Use of Pyramid
Passive Thermosiphon Loop.
The descending (~105 m) and ascending (~39 m upper + continuation) passages of the Great Pyramid, both inclined at precisely 26.3–26.5° from horizontal, form a large-diameter (~1 m) thermosiphon loop connected at the rock-masonry interface to a paleokarst fracture/cavity reservoir in Middle Eocene limestone. This angle is the engineering sweet spot for stable, unidirectional natural circulation under low buoyancy heads: experimental data on natural circulation loops show transition from weak/geysering/unstable flow below ~20–25° to robust single-phase or low-void-fraction circulation above ~25–35°, where buoyancy and frictional/gravity components optimally balance.
A modest ΔT ≈ 3–7 K (interior "hot" leg warmed by chamber heat/rock thermal mass vs. flood-cooled base leg in hydraulic contact with phreatic paleokarst) generates buoyancy head Δp_b ≈ ρ g β ΔT H_v, with effective vertical height H_v ≈ 22–25 m, yielding ~150–400 Pa—sufficient to drive Re ~ 10³–10⁴ flow after roughness (ε/D ≈ 0.01–0.03), entrance/exit, and minor losses are overcome. Flood-stage saturation of the lower node enables seasonal on/off operation; low-water drains the loop.
Falsifiable tests: (1) Ground-penetrating radar / muography showing saturated paleokarst conduits directly beneath the passage junction node; (2) isotopic or sediment traces of cyclic Nile water along passage floors/walls; (3) anomalous temperature gradients or slow persistent moisture flow at the interface today or in sealed-core samples; (4) hydraulic conductivity measurements confirming the required permeability at the base node. This provides a physically grounded mechanism for ancient flood-driven water circulation (drainage, cooling, or controlled ritual flow) without pumps or external power.
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